diff --git a/src/cmd/acme/mail/reply.c b/src/cmd/acme/mail/reply.c
index a44441c..9d6fd35 100644
--- a/src/cmd/acme/mail/reply.c
+++ b/src/cmd/acme/mail/reply.c
@@ -477,6 +477,7 @@
 	if(ofd > 0){
 		/* From dhog Fri Aug 24 22:13:00 EDT 2001 */
 		now = ctime(time(0));
+		seek(ofd, 0, 2);
 		fprint(ofd, "From %s %s", user, now);
 		fprint(ofd, "From: %s\n", user);
 		fprint(ofd, "Date: %s", now);