diff --git a/gflib/string_util.c b/gflib/string_util.c
index 17b055ad0a..6720299a82 100644
--- a/gflib/string_util.c
+++ b/gflib/string_util.c
@@ -823,7 +823,7 @@ void ConvertInternationalString(u8 *s, u8 language)
 
         i--;
 
-        while (i != (u8)-1)
+        while (i != -1)
         {
             s[i + 2] = s[i];
             i--;