--- src/bin/mailbox/main.c.org	Sat Sep 12 01:19:22 1992
+++ src/bin/mailbox/main.c	Mon Jan  3 14:27:04 2000
@@ -453,7 +453,8 @@
 	    if (atp != nil) {
 		char* dotp = strchr(atp, '.');
 		if (dotp != nil) {
-		    for (int i = 0; i < strlen(mail_domain); ++i) {
+		    int i;
+		    for (i = 0; i < strlen(mail_domain); ++i) {
 			char c = dotp[i];
 			c = isupper(c) ? c - 'A' + 'a' : c;
 			if (c != mail_domain[i]) {