diff --git a/include/xlocale/_ctype.h b/include/xlocale/_ctype.h
index aaad8da5418c..9cb3385ce211 100644
--- a/include/xlocale/_ctype.h
+++ b/include/xlocale/_ctype.h
@@ -68,6 +68,11 @@ _RuneLocale	*__runes_for_locale(locale_t, int*);
 #endif /* _XLOCALE_INLINE */
 
 #ifdef _XLOCALE_WCTYPES
+_XLOCALE_INLINE int
+__maskrune_l(__ct_rune_t __c, unsigned long __f, locale_t __loc);
+_XLOCALE_INLINE __inline int
+__istype_l(__ct_rune_t __c, unsigned long __f, locale_t __loc);
+
 _XLOCALE_INLINE int
 __maskrune_l(__ct_rune_t __c, unsigned long __f, locale_t __loc)
 {