diff --git a/test/cfg/gnu.c b/test/cfg/gnu.c
index 864c8eb07..d77af138e 100644
--- a/test/cfg/gnu.c
+++ b/test/cfg/gnu.c
@@ -16,10 +16,29 @@
 #include <sys/types.h>
 #include <pwd.h>
 #include <sys/mman.h>
+#include <wchar.h>
 #ifndef __CYGWIN__
 #include <sys/epoll.h>
 #endif
 
+void *nullPointer_mempcpy(void *dest, const void *src, size_t n)
+{
+    // cppcheck-suppress nullPointer
+    (void) mempcpy(NULL,src,n);
+    // cppcheck-suppress nullPointer
+    (void) mempcpy(dest,NULL,n);
+    return mempcpy(dest,src,n);
+}
+
+wchar_t *nullPointer_wmempcpy(wchar_t *dest, const wchar_t *src, size_t n)
+{
+    // cppcheck-suppress nullPointer
+    (void) wmempcpy(NULL,src,n);
+    // cppcheck-suppress nullPointer
+    (void) wmempcpy(dest,NULL,n);
+    return wmempcpy(dest,src,n);
+}
+
 int uninitvar_getpw(uid_t uid, char *buf)
 {
     uid_t someUid;