1 files changed, 2 insertions, 4 deletions
diff --git a/gfxinit.c b/gfxinit.c
index 522687627..fbc0e1e9c 100644
--- a/gfxinit.c
+++ b/gfxinit.c
@@ -9,6 +9,7 @@
 #include "spritecache.h"
 #include "table/sprites.h"
 #include "fileio.h"
+#include "string.h"
 #include "newgrf.h"
 #include "md5.h"
 #include "variables.h"
@@ -123,10 +124,7 @@ static bool FileMD5(const MD5File file, bool warn)
 
 #if !defined(WIN32)
 	if (f == NULL) {
-		char *s;
-	// make lower case and check again
-		for (s = buf + strlen(_path.data_dir) - 1; *s != '\0'; s++)
-			*s = tolower(*s);
+		strtolower(buf + strlen(_path.data_dir) - 1);
 		f = fopen(buf, "rb");
 	}
 #endif