diff --git a/src/base_media_base.h b/src/base_media_base.h
--- a/src/base_media_base.h
+++ b/src/base_media_base.h
@@ -31,7 +31,7 @@ struct BaseSet {
 	static const size_t NUM_FILES = Tnum_files;
 
 	/** Internal names of the files in this set. */
-	static const char *file_names[Tnum_files];
+	static const char **file_names;
 
 	const char *name;          ///< The name of the base set
 	const char *description;   ///< Description of the base set
diff --git a/src/gfxinit.cpp b/src/gfxinit.cpp
--- a/src/gfxinit.cpp
+++ b/src/gfxinit.cpp
@@ -106,7 +106,7 @@ void CheckExternalFiles()
 	char *add_pos = error_msg;
 	const char *last = lastof(error_msg);
 
-	for (uint i = 0; i < lengthof(used_set->files); i++) {
+	for (uint i = 0; i < MAX_GFT; i++) {
 		if (!used_set->files[i].CheckMD5()) {
 			add_pos += seprintf(add_pos, last, "Your '%s' file is corrupted or missing! %s\n", used_set->files[i].filename, used_set->files[i].missing_warning);
 		}
@@ -231,8 +231,11 @@ bool MD5File::CheckMD5() const
 }
 
 /** Names corresponding to the GraphicsFileType */
+const char *_graphics_file_names[] = { "base", "logos", "arctic", "tropical", "toyland", "extra" };
+
+/** Implementation */
 template <class T, size_t Tnum_files>
-/* static */ const char *BaseSet<T, Tnum_files>::file_names[Tnum_files] = { "base", "logos", "arctic", "tropical", "toyland", "extra" };
+/* static */ const char **BaseSet<T, Tnum_files>::file_names = _graphics_file_names;
 
 extern void UpdateNewGRFConfigPalette();
 
diff --git a/src/sound.cpp b/src/sound.cpp
--- a/src/sound.cpp
+++ b/src/sound.cpp
@@ -260,8 +260,11 @@ void SndPlayFx(SoundID sound)
 INSTANTIATE_BASE_MEDIA_METHODS(BaseMedia<SoundsSet>, SoundsSet)
 
 /** Names corresponding to the sound set's files */
+const char *_sound_file_names[] = { "samples" };
+
+
 template <class T, size_t Tnum_files>
-/* static */ const char *BaseSet<T, Tnum_files>::file_names[Tnum_files] = { "samples" };
+/* static */ const char **BaseSet<T, Tnum_files>::file_names = _sound_file_names;
 
 template <class Tbase_set>
 /* static */ const char *BaseMedia<Tbase_set>::GetExtension()