diff --git a/glib/gtypes.h b/glib/gtypes.h
index 9d912d523..2dba92f11 100644
--- a/glib/gtypes.h
+++ b/glib/gtypes.h
@@ -247,7 +247,7 @@ typedef const gchar *   (*GTranslateFunc)       (const gchar   *str,
  */
 #if defined (__GNUC__) && (__GNUC__ >= 2) && defined (__OPTIMIZE__)
 
-#  if __GNUC__ >= 4 && defined (__GNUC_MINOR__) && __GNUC_MINOR__ >= 3
+#  if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)
 #    define GUINT32_SWAP_LE_BE(val) ((guint32) __builtin_bswap32 ((guint32) (val)))
 #    define GUINT64_SWAP_LE_BE(val) ((guint64) __builtin_bswap64 ((guint64) (val)))
 #  endif