diff --git a/configure b/configure

index dc5d93f..ab7acb8 100755

--- a/configure

+++ b/configure

@@ -5264,8 +5264,8 @@ main ()

   for (i = 0; i < 256; i++)

     if (XOR (islower (i), ISLOWER (i))

 	|| toupper (i) != TOUPPER (i))

-      exit(2);

-  exit (0);

+      return 2;

+  return 0;

 }

 _ACEOF

 rm -f conftest$ac_exeext