Index: src/gtkballs.c
--- src/gtkballs.c.orig
+++ src/gtkballs.c
@@ -151,7 +151,7 @@ int main(int argc, char **argv)
 #ifdef ENABLE_NLS
    bindtextdomain (PACKAGE, LOCALEDIR);
    textdomain (PACKAGE);
-   bind_textdomain_codeset(PACKAGE, "UTF8");
+   bind_textdomain_codeset(PACKAGE, "UTF-8");
 #endif /* ENABLE_NLS */
 
    /* initialize random seed */
