diff --git a/cfg/posix.cfg b/cfg/posix.cfg
index 0c1f6e430..db4f604d6 100644
--- a/cfg/posix.cfg
+++ b/cfg/posix.cfg
@@ -1736,7 +1736,10 @@ The function 'mktemp' is considered to be dangerous due to race conditions and s
     <arg nr="1">
       <not-uninit/>
     </arg>
-    <arg nr="4"/>
+    <arg nr="4">
+      <not-uninit/>
+    </arg>
+    <arg nr="5"/>
   </function>
   <!-- void setpwent(void); -->
   <function name="setpwent">