diff --git a/src/actions.h b/src/actions.h
index 412e360..f64e775 100644
--- a/src/actions.h
+++ b/src/actions.h
@@ -5,8 +5,6 @@
 #include "obj_types.h"
 #include "proto_types.h"
 
-#include <stdbool.h>
-
 extern int _action_in_explode;
 extern const int gNormalDeathAnimations[DAMAGE_TYPE_COUNT];
 extern const int gMaximumBloodDeathAnimations[DAMAGE_TYPE_COUNT];
diff --git a/src/animation.h b/src/animation.h
index 1a16828..d545c53 100644
--- a/src/animation.h
+++ b/src/animation.h
@@ -6,8 +6,6 @@
 #include "obj_types.h"
 #include "sound.h"
 
-#include <stdbool.h>
-
 #define ANIMATION_SEQUENCE_LIST_CAPACITY (32)
 #define ANIMATION_DESCRIPTION_LIST_CAPACITY (55)
 
diff --git a/src/audio_file.h b/src/audio_file.h
index 59f7504..fa10b08 100644
--- a/src/audio_file.h
+++ b/src/audio_file.h
@@ -3,8 +3,6 @@
 
 #include "sound_decoder.h"
 
-#include <stdbool.h>
-
 typedef enum AudioFileFlags {
     AUDIO_FILE_IN_USE = 0x01,
     AUDIO_FILE_COMPRESSED = 0x02,
diff --git a/src/automap.h b/src/automap.h
index 5d669f3..647874b 100644
--- a/src/automap.h
+++ b/src/automap.h
@@ -4,8 +4,6 @@
 #include "db.h"
 #include "map_defs.h"
 
-#include <stdbool.h>
-
 #define AUTOMAP_DB ("AUTOMAP.DB")
 #define AUTOMAP_TMP ("AUTOMAP.TMP")
 
diff --git a/src/autorun.h b/src/autorun.h
index 44a718e..ba84d7e 100644
--- a/src/autorun.h
+++ b/src/autorun.h
@@ -1,8 +1,6 @@
 #ifndef AUTORUN_H
 #define AUTORUN_H
 
-#include <stdbool.h>
-
 #define WIN32_LEAN_AND_MEAN
 #include <windows.h>
 
diff --git a/src/cache.h b/src/cache.h
index dfe371a..31cca22 100644
--- a/src/cache.h
+++ b/src/cache.h
@@ -3,8 +3,6 @@
 
 #include "heap.h"
 
-#include <stdbool.h>
-
 #define INVALID_CACHE_ENTRY ((CacheEntry*)-1)
 
 // The initial number of cache entries in new cache.
diff --git a/src/character_selector.h b/src/character_selector.h
index 257bf7e..014531e 100644
--- a/src/character_selector.h
+++ b/src/character_selector.h
@@ -3,8 +3,6 @@
 
 #include "art.h"
 
-#include <stdbool.h>
-
 #define CS_WINDOW_WIDTH (640)
 #define CS_WINDOW_HEIGHT (480)
 
diff --git a/src/color.h b/src/color.h
index fd6b7cb..0ad16c7 100644
--- a/src/color.h
+++ b/src/color.h
@@ -3,7 +3,6 @@
 
 #include "memory_defs.h"
 
-#include <stdbool.h>
 #include <stdlib.h>
 
 typedef char*(ColorFileNameManger)(char*);
diff --git a/src/combat_ai.h b/src/combat_ai.h
index 521e566..e884cd5 100644
--- a/src/combat_ai.h
+++ b/src/combat_ai.h
@@ -8,8 +8,6 @@
 #include "obj_types.h"
 #include "party_member.h"
 
-#include <stdbool.h>
-
 #define AI_PACKET_CHEM_PRIMARY_DESIRE_COUNT (3)
 
 typedef enum AiMessageType {
diff --git a/src/config.h b/src/config.h
index 09dabf5..34a5488 100644
--- a/src/config.h
+++ b/src/config.h
@@ -3,8 +3,6 @@
 
 #include "dictionary.h"
 
-#include <stdbool.h>
-
 #define CONFIG_FILE_MAX_LINE_LENGTH (256)
 
 // The initial number of sections (or key-value) pairs in the config.
diff --git a/src/core.h b/src/core.h
index c934568..0bf9188 100644
--- a/src/core.h
+++ b/src/core.h
@@ -8,8 +8,6 @@
 
 #include <SDL.h>
 
-#include <stdbool.h>
-
 #define MOUSE_DEFAULT_CURSOR_WIDTH 8
 #define MOUSE_DEFAULT_CURSOR_HEIGHT 8
 #define MOUSE_DEFAULT_CURSOR_SIZE (MOUSE_DEFAULT_CURSOR_WIDTH * MOUSE_DEFAULT_CURSOR_HEIGHT)
diff --git a/src/credits.h b/src/credits.h
index 2eace56..e416225 100644
--- a/src/credits.h
+++ b/src/credits.h
@@ -3,8 +3,6 @@
 
 #include "db.h"
 
-#include <stdbool.h>
-
 #define CREDITS_WINDOW_WIDTH (640)
 #define CREDITS_WINDOW_HEIGHT (480)
 #define CREDITS_WINDOW_SCROLLING_DELAY (38)
diff --git a/src/critter.h b/src/critter.h
index 5c84789..9849222 100644
--- a/src/critter.h
+++ b/src/critter.h
@@ -6,8 +6,6 @@
 #include "obj_types.h"
 #include "proto_types.h"
 
-#include <stdbool.h>
-
 // Maximum length of dude's name length.
 #define DUDE_NAME_MAX_LENGTH (32)
 
diff --git a/src/cycle.h b/src/cycle.h
index 4c3e7c5..5cc6b4c 100644
--- a/src/cycle.h
+++ b/src/cycle.h
@@ -1,8 +1,6 @@
 #ifndef CYCLE_H
 #define CYCLE_H
 
-#include <stdbool.h>
-
 #define COLOR_CYCLE_PERIOD_1 (200U)
 #define COLOR_CYCLE_PERIOD_2 (142U)
 #define COLOR_CYCLE_PERIOD_3 (100U)
diff --git a/src/db.h b/src/db.h
index 0d9e45e..6d4ce6e 100644
--- a/src/db.h
+++ b/src/db.h
@@ -4,7 +4,6 @@
 #include "memory_defs.h"
 #include "xfile.h"
 
-#include <stdbool.h>
 #include <stddef.h>
 
 typedef XFile File;
diff --git a/src/dfile.h b/src/dfile.h
index c831d61..54e5b2d 100644
--- a/src/dfile.h
+++ b/src/dfile.h
@@ -4,7 +4,6 @@
 #define WIN32_LEAN_AND_MEAN
 #include <windows.h>
 
-#include <stdbool.h>
 #include <stdio.h>
 #include <zlib.h>
 
diff --git a/src/dictionary.cc b/src/dictionary.cc
index 39ca87f..2cb9252 100644
--- a/src/dictionary.cc
+++ b/src/dictionary.cc
@@ -1,7 +1,6 @@
 #include "dictionary.h"
 
 #include <assert.h>
-#include <stdbool.h>
 #include <stdlib.h>
 #include <string.h>
 
diff --git a/src/display_monitor.h b/src/display_monitor.h
index 038bc75..db72546 100644
--- a/src/display_monitor.h
+++ b/src/display_monitor.h
@@ -3,8 +3,6 @@
 
 #include "geometry.h"
 
-#include <stdbool.h>
-
 // The maximum number of lines display monitor can hold. Once this value
 // is reached earlier messages are thrown away.
 #define DISPLAY_MONITOR_LINES_CAPACITY (100)
diff --git a/src/endgame.h b/src/endgame.h
index eb841cd..b3a2bdb 100644
--- a/src/endgame.h
+++ b/src/endgame.h
@@ -5,8 +5,6 @@
 #define WIN32_LEAN_AND_MEAN
 #include <windows.h>
 
-#include <stdbool.h>
-
 typedef enum EndgameDeathEndingReason {
     // Dude died.
     ENDGAME_DEATH_ENDING_REASON_DEATH = 0,
diff --git a/src/file_find.h b/src/file_find.h
index 10490d9..0dbb552 100644
--- a/src/file_find.h
+++ b/src/file_find.h
@@ -1,8 +1,6 @@
 #ifndef FILE_FIND_H
 #define FILE_FIND_H
 
-#include <stdbool.h>
-
 #define WIN32_LEAN_AND_MEAN
 #include <windows.h>
 
diff --git a/src/file_utils.cc b/src/file_utils.cc
index 52bde9f..725eb62 100644
--- a/src/file_utils.cc
+++ b/src/file_utils.cc
@@ -3,7 +3,6 @@
 
 #include "file_utils.h"
 
-#include <stdbool.h>
 #include <stdio.h>
 #include <zlib.h>
 
diff --git a/src/font_manager.h b/src/font_manager.h
index c6117dd..42b1230 100644
--- a/src/font_manager.h
+++ b/src/font_manager.h
@@ -3,8 +3,6 @@
 
 #include "text_font.h"
 
-#include <stdbool.h>
-
 // The maximum number of interface fonts.
 #define INTERFACE_FONT_MAX (16)
 
diff --git a/src/game.h b/src/game.h
index 0959aa6..532258c 100644
--- a/src/game.h
+++ b/src/game.h
@@ -4,8 +4,6 @@
 #include "game_vars.h"
 #include "message.h"
 
-#include <stdbool.h>
-
 extern char _aGame_0[];
 
 extern bool gGameUiDisabled;
diff --git a/src/game_config.h b/src/game_config.h
index 784d339..5f5e11f 100644
--- a/src/game_config.h
+++ b/src/game_config.h
@@ -3,8 +3,6 @@
 
 #include "config.h"
 
-#include <stdbool.h>
-
 // The file name of the main config file.
 #define GAME_CONFIG_FILE_NAME "fallout2.cfg"
 
diff --git a/src/game_dialog.h b/src/game_dialog.h
index d299d04..7b98253 100644
--- a/src/game_dialog.h
+++ b/src/game_dialog.h
@@ -8,8 +8,6 @@
 #include "message.h"
 #include "obj_types.h"
 
-#include <stdbool.h>
-
 #define DIALOG_REVIEW_ENTRIES_CAPACITY 80
 
 #define DIALOG_OPTION_ENTRIES_CAPACITY 30
diff --git a/src/game_mouse.h b/src/game_mouse.h
index 2f68658..82106dd 100644
--- a/src/game_mouse.h
+++ b/src/game_mouse.h
@@ -5,8 +5,6 @@
 #include "geometry.h"
 #include "obj_types.h"
 
-#include <stdbool.h>
-
 typedef enum ScrollableDirections {
     SCROLLABLE_W = 0x01,
     SCROLLABLE_E = 0x02,
diff --git a/src/game_movie.h b/src/game_movie.h
index 88a70b6..fb574ec 100644
--- a/src/game_movie.h
+++ b/src/game_movie.h
@@ -3,8 +3,6 @@
 
 #include "db.h"
 
-#include <stdbool.h>
-
 #define WIN32_LEAN_AND_MEAN
 #include <windows.h>
 
diff --git a/src/game_sound.cc b/src/game_sound.cc
index 132f396..461a661 100644
--- a/src/game_sound.cc
+++ b/src/game_sound.cc
@@ -21,7 +21,6 @@
 #include "window_manager.h"
 #include "world_map.h"
 
-#include <stdbool.h>
 #include <stdio.h>
 #include <string.h>
 
diff --git a/src/game_sound.h b/src/game_sound.h
index 87aa6a1..bb23ac8 100644
--- a/src/game_sound.h
+++ b/src/game_sound.h
@@ -4,8 +4,6 @@
 #include "obj_types.h"
 #include "sound.h"
 
-#include <stdbool.h>
-
 #define WIN32_LEAN_AND_MEAN
 #include <windows.h>
 
diff --git a/src/heap.h b/src/heap.h
index 4795fae..fdd78d7 100644
--- a/src/heap.h
+++ b/src/heap.h
@@ -1,8 +1,6 @@
 #ifndef HEAP_H
 #define HEAP_H
 
-#include <stdbool.h>
-
 #define HEAP_BLOCK_HEADER_GUARD (0xDEADC0DE)
 #define HEAP_BLOCK_FOOTER_GUARD (0xACDCACDC)
 
diff --git a/src/interface.h b/src/interface.h
index b7f3141..ef9fed5 100644
--- a/src/interface.h
+++ b/src/interface.h
@@ -6,8 +6,6 @@
 #include "geometry.h"
 #include "obj_types.h"
 
-#include <stdbool.h>
-
 typedef enum Hand {
     // Item1 (Punch)
     HAND_LEFT,
diff --git a/src/interpreter.h b/src/interpreter.h
index ef92cfe..beee1bf 100644
--- a/src/interpreter.h
+++ b/src/interpreter.h
@@ -2,7 +2,6 @@
 #define INTERPRETER_H
 
 #include <setjmp.h>
-#include <stdbool.h>
 
 // The maximum number of opcodes.
 #define OPCODE_MAX_COUNT (342)
diff --git a/src/interpreter_extra.h b/src/interpreter_extra.h
index e1362ce..2f7a4f5 100644
--- a/src/interpreter_extra.h
+++ b/src/interpreter_extra.h
@@ -6,8 +6,6 @@
 #include "interpreter.h"
 #include "obj_types.h"
 
-#include <stdbool.h>
-
 typedef enum ScriptError {
     SCRIPT_ERROR_NOT_IMPLEMENTED,
     SCRIPT_ERROR_OBJECT_IS_NULL,
diff --git a/src/inventory.h b/src/inventory.h
index 0cf7395..41ed42a 100644
--- a/src/inventory.h
+++ b/src/inventory.h
@@ -6,8 +6,6 @@
 #include "message.h"
 #include "obj_types.h"
 
-#include <stdbool.h>
-
 #define INVENTORY_NORMAL_WINDOW_PC_ROTATION_DELAY (1000U / ROTATION_COUNT)
 #define OFF_59E7BC_COUNT 12
 
diff --git a/src/item.h b/src/item.h
index d02183d..8c54038 100644
--- a/src/item.h
+++ b/src/item.h
@@ -5,8 +5,6 @@
 #include "message.h"
 #include "obj_types.h"
 
-#include <stdbool.h>
-
 #define ADDICTION_COUNT (9)
 
 typedef enum _WeaponClass {
diff --git a/src/light.h b/src/light.h
index 90b75b0..3f84d62 100644
--- a/src/light.h
+++ b/src/light.h
@@ -3,8 +3,6 @@
 
 #include "map_defs.h"
 
-#include <stdbool.h>
-
 #define LIGHT_LEVEL_MIN (65536 / 4)
 #define LIGHT_LEVEL_MAX 65536
 
diff --git a/src/lips.h b/src/lips.h
index f0e5d4c..1ad9bcf 100644
--- a/src/lips.h
+++ b/src/lips.h
@@ -4,7 +4,6 @@
 #include "db.h"
 #include "sound.h"
 
-#include <stdbool.h>
 #include <stddef.h>
 
 #define PHONEME_COUNT (42)
diff --git a/src/loadsave.h b/src/loadsave.h
index 596b6bf..112742b 100644
--- a/src/loadsave.h
+++ b/src/loadsave.h
@@ -6,8 +6,6 @@
 #include "geometry.h"
 #include "message.h"
 
-#include <stdbool.h>
-
 #define WIN32_LEAN_AND_MEAN
 #include <windows.h>
 
diff --git a/src/main.h b/src/main.h
index dd89a59..87e1078 100644
--- a/src/main.h
+++ b/src/main.h
@@ -4,8 +4,6 @@
 #include "art.h"
 #include "fps_limiter.h"
 
-#include <stdbool.h>
-
 typedef enum MainMenuButton {
     MAIN_MENU_BUTTON_INTRO,
     MAIN_MENU_BUTTON_NEW_GAME,
diff --git a/src/map.h b/src/map.h
index 0f8a278..cc9ca6f 100644
--- a/src/map.h
+++ b/src/map.h
@@ -7,8 +7,6 @@
 #include "map_defs.h"
 #include "message.h"
 
-#include <stdbool.h>
-
 #define WIN32_LEAN_AND_MEAN
 #include <windows.h>
 
diff --git a/src/map_defs.h b/src/map_defs.h
index 87a2c95..33124bd 100644
--- a/src/map_defs.h
+++ b/src/map_defs.h
@@ -1,8 +1,6 @@
 #ifndef MAPDEFS_H
 #define MAPDEFS_H
 
-#include <stdbool.h>
-
 #define ELEVATION_COUNT (3)
 
 #define SQUARE_GRID_WIDTH (100)
diff --git a/src/message.h b/src/message.h
index b763508..b8fb129 100644
--- a/src/message.h
+++ b/src/message.h
@@ -3,8 +3,6 @@
 
 #include "db.h"
 
-#include <stdbool.h>
-
 #define BADWORD_LENGTH_MAX 80
 
 #define MESSAGE_LIST_ITEM_TEXT_FILTERED 0x01
diff --git a/src/mmx.h b/src/mmx.h
index 547ef7f..4c97a29 100644
--- a/src/mmx.h
+++ b/src/mmx.h
@@ -1,8 +1,6 @@
 #ifndef MMX_H
 #define MMX_H
 
-#include <stdbool.h>
-
 bool mmxIsSupported();
 void mmxBlit(unsigned char* dest, int destPitch, unsigned char* src, int srcPitch, int width, int height);
 void mmxBlitTrans(unsigned char* dest, int destPitch, unsigned char* src, int srcPitch, int width, int height);
diff --git a/src/movie_effect.h b/src/movie_effect.h
index ab2b3ec..ac872f7 100644
--- a/src/movie_effect.h
+++ b/src/movie_effect.h
@@ -1,8 +1,6 @@
 #ifndef MOVIE_EFFECT_H
 #define MOVIE_EFFECT_H
 
-#include <stdbool.h>
-
 typedef enum MovieEffectType {
     MOVIE_EFFECT_TYPE_NONE = 0,
     MOVIE_EFFECT_TYPE_FADE_IN = 1,
diff --git a/src/movie_lib.h b/src/movie_lib.h
index 06f2920..e19a650 100644
--- a/src/movie_lib.h
+++ b/src/movie_lib.h
@@ -8,8 +8,6 @@
 #define DIRECTSOUND_VERSION 0x0300
 #include <dsound.h>
 
-#include <stdbool.h>
-
 typedef struct STRUCT_6B3690 {
     void* field_0;
     int field_4;
diff --git a/src/options.h b/src/options.h
index f0b72c9..341ba35 100644
--- a/src/options.h
+++ b/src/options.h
@@ -6,8 +6,6 @@
 #include "message.h"
 #include "geometry.h"
 
-#include <stdbool.h>
-
 #define OPTIONS_WINDOW_BUTTONS_COUNT (10)
 #define PRIMARY_OPTION_VALUE_COUNT (4)
 #define SECONDARY_OPTION_VALUE_COUNT (2)
diff --git a/src/party_member.h b/src/party_member.h
index 5931a19..f87cccf 100644
--- a/src/party_member.h
+++ b/src/party_member.h
@@ -6,8 +6,6 @@
 #include "obj_types.h"
 #include "scripts.h"
 
-#include <stdbool.h>
-
 typedef struct PartyMemberDescription {
     bool areaAttackMode[AREA_ATTACK_MODE_COUNT];
     bool runAwayMode[RUN_AWAY_MODE_COUNT];
diff --git a/src/perk.h b/src/perk.h
index 044f045..55fb641 100644
--- a/src/perk.h
+++ b/src/perk.h
@@ -7,8 +7,6 @@
 #include "perk_defs.h"
 #include "stat_defs.h"
 
-#include <stdbool.h>
-
 typedef struct PerkDescription {
     char* name;
     char* description;
diff --git a/src/pipboy.h b/src/pipboy.h
index eee8de2..6be51c7 100644
--- a/src/pipboy.h
+++ b/src/pipboy.h
@@ -6,8 +6,6 @@
 #include "geometry.h"
 #include "message.h"
 
-#include <stdbool.h>
-
 #define PIPBOY_WINDOW_WIDTH (640)
 #define PIPBOY_WINDOW_HEIGHT (480)
 
diff --git a/src/proto_instance.h b/src/proto_instance.h
index 1e93aa0..a7af363 100644
--- a/src/proto_instance.h
+++ b/src/proto_instance.h
@@ -4,8 +4,6 @@
 #include "message.h"
 #include "obj_types.h"
 
-#include <stdbool.h>
-
 extern MessageListItem stru_49A990;
 
 int _obj_sid(Object* object, int* sidPtr);
diff --git a/src/queue.h b/src/queue.h
index 91fd1c4..22ac198 100644
--- a/src/queue.h
+++ b/src/queue.h
@@ -4,8 +4,6 @@
 #include "db.h"
 #include "obj_types.h"
 
-#include <stdbool.h>
-
 typedef enum EventType {
     EVENT_TYPE_DRUG = 0,
     EVENT_TYPE_KNOCKOUT = 1,
diff --git a/src/scripts.h b/src/scripts.h
index 0901eb1..2db98bd 100644
--- a/src/scripts.h
+++ b/src/scripts.h
@@ -7,8 +7,6 @@
 #include "message.h"
 #include "obj_types.h"
 
-#include <stdbool.h>
-
 #define SCRIPT_LIST_EXTENT_SIZE 16
 
 #define SCRIPT_FLAG_0x01 (0x01)
diff --git a/src/sfall_config.h b/src/sfall_config.h
index fe0b6d7..69be7a0 100644
--- a/src/sfall_config.h
+++ b/src/sfall_config.h
@@ -3,8 +3,6 @@
 
 #include "config.h"
 
-#include <stdbool.h>
-
 #define SFALL_CONFIG_FILE_NAME "ddraw.ini"
 
 #define SFALL_CONFIG_MISC_KEY "Misc"
diff --git a/src/skill.h b/src/skill.h
index 63e787e..64b1bd5 100644
--- a/src/skill.h
+++ b/src/skill.h
@@ -7,8 +7,6 @@
 #include "proto_types.h"
 #include "skill_defs.h"
 
-#include <stdbool.h>
-
 #define SKILLS_MAX_USES_PER_DAY (3)
 
 #define REPAIRABLE_DAMAGE_FLAGS_LENGTH (5)
diff --git a/src/skilldex.h b/src/skilldex.h
index 0cc81a7..a3a6de7 100644
--- a/src/skilldex.h
+++ b/src/skilldex.h
@@ -5,8 +5,6 @@
 #include "geometry.h"
 #include "message.h"
 
-#include <stdbool.h>
-
 #define SKILLDEX_SKILL_BUTTON_BUFFER_COUNT (SKILLDEX_SKILL_COUNT * 2)
 
 typedef enum SkilldexFrm {
diff --git a/src/sound_decoder.h b/src/sound_decoder.h
index b165c43..b81d337 100644
--- a/src/sound_decoder.h
+++ b/src/sound_decoder.h
@@ -1,7 +1,6 @@
 #ifndef SOUND_DECODER_H
 #define SOUND_DECODER_H
 
-#include <stdbool.h>
 #include <stddef.h>
 
 #define SOUND_DECODER_IN_BUFFER_SIZE (512)
diff --git a/src/sound_effects_cache.h b/src/sound_effects_cache.h
index 399624c..6fdcabe 100644
--- a/src/sound_effects_cache.h
+++ b/src/sound_effects_cache.h
@@ -3,8 +3,6 @@
 
 #include "cache.h"
 
-#include <stdbool.h>
-
 // The maximum number of sound effects that can be loaded and played
 // simultaneously.
 #define SOUND_EFFECTS_MAX_COUNT (4)
diff --git a/src/sound_effects_list.h b/src/sound_effects_list.h
index 10341f9..fbe8bda 100644
--- a/src/sound_effects_list.h
+++ b/src/sound_effects_list.h
@@ -1,8 +1,6 @@
 #ifndef SOUND_EFFECTS_LIST_H
 #define SOUND_EFFECTS_LIST_H
 
-#include <stdbool.h>
-
 #define SFXL_OK (0)
 #define SFXL_ERR (1)
 #define SFXL_ERR_TAG_INVALID (2)
diff --git a/src/stat.h b/src/stat.h
index 4f91ffc..6c9876c 100644
--- a/src/stat.h
+++ b/src/stat.h
@@ -7,8 +7,6 @@
 #include "proto_types.h"
 #include "stat_defs.h"
 
-#include <stdbool.h>
-
 #define STAT_ERR_INVALID_STAT (-5)
 
 // Provides metadata about stats.
diff --git a/src/text_font.h b/src/text_font.h
index 0fd00ad..bd59028 100644
--- a/src/text_font.h
+++ b/src/text_font.h
@@ -1,8 +1,6 @@
 #ifndef TEXT_FONT_H
 #define TEXT_FONT_H
 
-#include <stdbool.h>
-
 // The maximum number of text fonts.
 #define TEXT_FONT_MAX (10)
 
diff --git a/src/text_object.h b/src/text_object.h
index fa7fdf2..f9f10b3 100644
--- a/src/text_object.h
+++ b/src/text_object.h
@@ -4,8 +4,6 @@
 #include "geometry.h"
 #include "obj_types.h"
 
-#include <stdbool.h>
-
 // The maximum number of text objects that can exist at the same time.
 #define TEXT_OBJECTS_MAX_COUNT (20)
 
diff --git a/src/tile.h b/src/tile.h
index a4b14ce..d07d884 100644
--- a/src/tile.h
+++ b/src/tile.h
@@ -5,8 +5,6 @@
 #include "map.h"
 #include "obj_types.h"
 
-#include <stdbool.h>
-
 #define TILE_SET_CENTER_FLAG_0x01 0x01
 #define TILE_SET_CENTER_FLAG_0x02 0x02
 
diff --git a/src/trait.h b/src/trait.h
index 4ce92a8..f2cf382 100644
--- a/src/trait.h
+++ b/src/trait.h
@@ -5,8 +5,6 @@
 #include "message.h"
 #include "trait_defs.h"
 
-#include <stdbool.h>
-
 // Provides metadata about traits.
 typedef struct TraitDescription {
     // The name of trait.
diff --git a/src/win32.h b/src/win32.h
index 8f7a7b6..076d34a 100644
--- a/src/win32.h
+++ b/src/win32.h
@@ -9,8 +9,6 @@
 #define DIRECTSOUND_VERSION 0x0300
 #include <dsound.h>
 
-#include <stdbool.h>
-
 typedef HRESULT(__stdcall DirectSoundCreateProc)(GUID*, LPDIRECTSOUND*, IUnknown*);
 
 extern DirectSoundCreateProc* gDirectSoundCreateProc;
diff --git a/src/window.h b/src/window.h
index 6d79d15..b1f9738 100644
--- a/src/window.h
+++ b/src/window.h
@@ -5,8 +5,6 @@
 #include "interpreter.h"
 #include "region.h"
 
-#include <stdbool.h>
-
 #define MANAGED_WINDOW_COUNT (16)
 
 typedef void (*WINDOWDRAWINGPROC)(unsigned char* src, int src_pitch, int a3, int src_x, int src_y, int src_width, int src_height, int dest_x, int dest_y);
diff --git a/src/window_manager.h b/src/window_manager.h
index 6b3751a..e1da1ec 100644
--- a/src/window_manager.h
+++ b/src/window_manager.h
@@ -3,7 +3,6 @@
 
 #include "geometry.h"
 
-#include <stdbool.h>
 #include <stddef.h>
 
 #define WIN32_LEAN_AND_MEAN
diff --git a/src/window_manager_private.h b/src/window_manager_private.h
index 00e6b17..c199ca7 100644
--- a/src/window_manager_private.h
+++ b/src/window_manager_private.h
@@ -1,8 +1,6 @@
 #ifndef WINDOW_MANAGER_PRIVATE_H
 #define WINDOW_MANAGER_PRIVATE_H
 
-#include <stdbool.h>
-
 typedef struct struc_177 struc_177;
 
 typedef struct STRUCT_6B2340 {
diff --git a/src/world_map.h b/src/world_map.h
index 65576ba..794583c 100644
--- a/src/world_map.h
+++ b/src/world_map.h
@@ -8,8 +8,6 @@
 #include "message.h"
 #include "obj_types.h"
 
-#include <stdbool.h>
-
 #define CITY_NAME_SIZE (40)
 #define TILE_WALK_MASK_NAME_SIZE (40)
 #define ENTRANCE_LIST_CAPACITY (10)
diff --git a/src/xfile.h b/src/xfile.h
index 4c19d53..50bfd35 100644
--- a/src/xfile.h
+++ b/src/xfile.h
@@ -3,7 +3,6 @@
 
 #include "dfile.h"
 
-#include <stdbool.h>
 #include <stdio.h>
 #include <zlib.h>