diff --git a/reactos/lib/sdk/crt/wstring/wcscspn.c b/reactos/lib/sdk/crt/wstring/wcscspn.c
index 1fcad259b43..a68dd776385 100644
--- a/reactos/lib/sdk/crt/wstring/wcscspn.c
+++ b/reactos/lib/sdk/crt/wstring/wcscspn.c
@@ -18,7 +18,7 @@ size_t wcscspn(const wchar_t *str,const wchar_t *reject)
 	wchar_t *s;
 	wchar_t *t;
 	s=(wchar_t *)str;
-	do {
+	while (*s) {
 		t=(wchar_t *)reject;
 		while (*t) {
 			if (*t==*s)
@@ -28,6 +28,6 @@ size_t wcscspn(const wchar_t *str,const wchar_t *reject)
 		if (*t)
 			break;
 		s++;
-	} while (*s);
+	}
 	return s-str; /* nr of wchars */
 }