diff --git a/src/core.cc b/src/core.cc
index bf3ba77..b2a7be2 100644
--- a/src/core.cc
+++ b/src/core.cc
@@ -13,6 +13,7 @@
 #include "window_manager_private.h"
 
 #include <limits.h>
+#include <string.h>
 #include <SDL.h>
 #include <SDL_syswm.h>
 
diff --git a/src/loadsave.cc b/src/loadsave.cc
index 4bdf654..f336201 100644
--- a/src/loadsave.cc
+++ b/src/loadsave.cc
@@ -42,6 +42,7 @@
 
 #include <assert.h>
 #include <stdio.h>
+#include <string.h>
 #include <time.h>
 
 #include <algorithm>
diff --git a/src/main.cc b/src/main.cc
index ce7ceeb..da1e42a 100644
--- a/src/main.cc
+++ b/src/main.cc
@@ -31,7 +31,9 @@
 #include "word_wrap.h"
 #include "world_map.h"
 
+#include <ctype.h>
 #include <limits.h>
+#include <string.h>
 
 #define MAIN_MENU_WINDOW_WIDTH 640
 #define MAIN_MENU_WINDOW_HEIGHT 480
diff --git a/src/map.cc b/src/map.cc
index 090e470..a19ea21 100644
--- a/src/map.cc
+++ b/src/map.cc
@@ -34,6 +34,7 @@
 #include "world_map.h"
 
 #include <stdio.h>
+#include <string.h>
 
 // 0x50B058
 char byte_50B058[] = "";
diff --git a/src/scripts.cc b/src/scripts.cc
index 90836a8..c4d0169 100644
--- a/src/scripts.cc
+++ b/src/scripts.cc
@@ -27,6 +27,7 @@
 
 #include <stdlib.h>
 #include <stdio.h>
+#include <string.h>
 #include <time.h>
 
 // 0x50D6B8
diff --git a/src/sound.cc b/src/sound.cc
index 3c17c2d..00291cb 100644
--- a/src/sound.cc
+++ b/src/sound.cc
@@ -9,6 +9,7 @@
 #include <math.h>
 #include <mmsystem.h>
 #include <stdlib.h>
+#include <string.h>
 
 #include <algorithm>
 
diff --git a/src/window_manager.cc b/src/window_manager.cc
index b7e69e2..d7bc980 100644
--- a/src/window_manager.cc
+++ b/src/window_manager.cc
@@ -12,6 +12,7 @@
 #include "window_manager_private.h"
 
 #include <SDL.h>
+#include <string.h>
 
 #include <algorithm>
 
diff --git a/src/world_map.cc b/src/world_map.cc
index 7809233..e6ba0a8 100644
--- a/src/world_map.cc
+++ b/src/world_map.cc
@@ -35,6 +35,7 @@
 #include "window_manager.h"
 
 #include <assert.h>
+#include <ctype.h>
 #include <stdio.h>
 #include <string.h>