diff --git a/include/wctype.h b/include/wctype.h
index 359cc3ba9930..3e2f694bce2c 100644
--- a/include/wctype.h
+++ b/include/wctype.h
@@ -93,14 +93,14 @@ __END_DECLS
 #define	iswblank(wc)		__istype((wc), _CTYPE_B)
 #define	iswcntrl(wc)		__istype((wc), _CTYPE_C)
 #define	iswctype(wc, charclass)	__istype((wc), (charclass))
-#define	iswdigit(wc)		__istype((wc), _CTYPE_D)
+#define	iswdigit(wc)		__isctype((wc), _CTYPE_D)
 #define	iswgraph(wc)		__istype((wc), _CTYPE_G)
 #define	iswlower(wc)		__istype((wc), _CTYPE_L)
 #define	iswprint(wc)		__istype((wc), _CTYPE_R)
 #define	iswpunct(wc)		__istype((wc), _CTYPE_P)
 #define	iswspace(wc)		__istype((wc), _CTYPE_S)
 #define	iswupper(wc)		__istype((wc), _CTYPE_U)
-#define	iswxdigit(wc)		__istype((wc), _CTYPE_X)
+#define	iswxdigit(wc)		__isctype((wc), _CTYPE_X)
 #define	towlower(wc)		__tolower(wc)
 #define	towupper(wc)		__toupper(wc)