diff --git a/include/xlocale/_ctype.h b/include/xlocale/_ctype.h
index 481fe33f31d2..7ffa7a1e0f69 100644
--- a/include/xlocale/_ctype.h
+++ b/include/xlocale/_ctype.h
@@ -78,8 +78,8 @@ __maskrune_l(__ct_rune_t __c, unsigned long __f, locale_t __loc)
 {
 	int __limit;
 	_RuneLocale *runes = __runes_for_locale(__loc, &__limit);
-	return (__c < 0 || __c >= _CACHED_RUNES) ? ___runetype_l(__c, __loc) :
-	       runes->__runetype[__c] & __f;
+	return ((__c < 0 || __c >= _CACHED_RUNES) ? ___runetype_l(__c, __loc) :
+	        runes->__runetype[__c]) & __f;
 }
 
 _XLOCALE_INLINE int