diff --git a/reactos/lib/sdk/crt/string/is_wctype.c b/reactos/lib/sdk/crt/string/is_wctype.c
index 030900010de..853e04c6c57 100644
--- a/reactos/lib/sdk/crt/string/is_wctype.c
+++ b/reactos/lib/sdk/crt/string/is_wctype.c
@@ -1,6 +1,6 @@
 #include <string.h>
 
-extern const unsigned short wine_wctype_table[];
+int iswctype(wint_t wc, wctype_t wctypeFlags);
 
 /*
  * obsolete