diff --git a/configure b/configure
index 057d5a9..2f34d4a 100755
--- a/configure
+++ b/configure
@@ -2758,8 +2758,8 @@ 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