diff --git a/src/sfall_ini.cc b/src/sfall_ini.cc
index 0347a3b..ee4aced 100644
--- a/src/sfall_ini.cc
+++ b/src/sfall_ini.cc
@@ -15,7 +15,7 @@ static constexpr size_t kFileNameMaxSize = 63;
 static constexpr size_t kSectionMaxSize = 32;
 
 /// Special .ini file names which are accessed without adding base path.
-static constexpr char* kSystemConfigFileNames[] = {
+static constexpr const char* kSystemConfigFileNames[] = {
     "ddraw.ini",
     "f2_res.ini",
 };
diff --git a/src/sfall_ini.h b/src/sfall_ini.h
index 793b853..ac4cdd8 100644
--- a/src/sfall_ini.h
+++ b/src/sfall_ini.h
@@ -1,6 +1,8 @@
 #ifndef FALLOUT_SFALL_INI_H_
 #define FALLOUT_SFALL_INI_H_
 
+#include <cstddef>
+
 namespace fallout {
 
 /// Sets base directory to lookup .ini files.