diff --git a/gcc/testsuite/gcc.dg/guality/param-5.c b/gcc/testsuite/gcc.dg/guality/param-5.c
index 83a5c0ed93dd..3ef1ad1e901f 100644
--- a/gcc/testsuite/gcc.dg/guality/param-5.c
+++ b/gcc/testsuite/gcc.dg/guality/param-5.c
@@ -12,7 +12,7 @@ clear_stack (void)
 {
   char a[128 * 1024 + 128];
 
-  __builtin_memset (a, 0, sizeof (a));
+  __builtin_memset (a, 0, 128);
 }
 
 __attribute__((noinline, noclone)) void