Index: test/safestack/overflow.c
===================================================================
--- test/safestack/overflow.c
+++ test/safestack/overflow.c
@@ -17,9 +17,13 @@
 
 int main(int argc, char **argv)
 {
+  int prebuf[7];
   int value1 = 42;
   int buffer[5];
   int value2 = 42;
+  int postbuf[7];
+  fct(prebuf + 1);
+  fct(postbuf + 1);
   fct(buffer);
   return value1 != 42 || value2 != 42;
 }