diff --git a/cfg/std.cfg b/cfg/std.cfg
index 8139df4b3..2cb78b954 100644
--- a/cfg/std.cfg
+++ b/cfg/std.cfg
@@ -4884,9 +4884,6 @@
   <function name="wcsrtombs">
     <noreturn>false</noreturn>
     <leak-ignore/>
-    <arg nr="1">
-      <not-null/>
-    </arg>
     <arg nr="2">
       <not-null/>
       <not-uninit/>