diff --git a/cfg/gnu.cfg b/cfg/gnu.cfg
index 9334e8d8d..339e1d99c 100644
--- a/cfg/gnu.cfg
+++ b/cfg/gnu.cfg
@@ -351,13 +351,13 @@
     <arg nr="1" direction="out">
       <not-null/>
     </arg>
-    <formatstr/>
     <arg nr="2" direction="in">
       <formatstr/>
       <not-uninit/>
     </arg>
-    <arg nr="3">
+    <arg nr="3" direction="in">
       <not-uninit/>
+      <not-bool/>
     </arg>
   </function>
   <!-- http://man7.org/linux/man-pages/man2/accept.2.html -->
diff --git a/test/cfg/gnu.c b/test/cfg/gnu.c
index 0b942d9b8..67995f7b7 100644
--- a/test/cfg/gnu.c
+++ b/test/cfg/gnu.c
@@ -11,6 +11,7 @@
 #include <stdlib.h>
 #include <stdint.h>
 #include <stdio.h>
+#include <stdarg.h>
 #include <sys/time.h>
 #ifndef __CYGWIN__
 #include <sys/epoll.h>
@@ -87,7 +88,7 @@ int no_resourceLeak_mkostemp_02(char *template, int flags)
     return mkostemp(template, flags);
 }
 
-void valid_code(int argInt1)
+void valid_code(int argInt1, va_list valist_arg)
 {
     char *p;
 
@@ -111,6 +112,11 @@ void valid_code(int argInt1)
     __builtin_prefetch(p, 0, 1);
 
     if (__builtin_types_compatible_p(int, char)) {}
+
+    char * pStr = NULL;
+    if (vasprintf(&pStr, "%d %d", valist_arg) != -1) {
+        free(pStr);
+    }
 }
 
 void ignoreleak(void)