diff --git a/libs/wine/string.c b/libs/wine/string.c
index d6fb88f8eca..16bb97bec8e 100644
--- a/libs/wine/string.c
+++ b/libs/wine/string.c
@@ -479,7 +479,7 @@ noconv:
 
 long int atolW( const WCHAR *str )
 {
-    return strtolW( str, (WCHAR **)0, 10 );
+    return strtolW( str, NULL, 10 );
 }
 
 int atoiW( const WCHAR *str )