diff --git a/monitor.c b/monitor.c
index 84d5168296b..fdc55250077 100644
--- a/monitor.c
+++ b/monitor.c
@@ -1123,6 +1123,7 @@ mm_answer_pam_account(struct ssh *ssh, int sock, struct sshbuf *m)
 	if ((r = sshbuf_put_u32(m, ret)) != 0 ||
 	    (r = sshbuf_put_stringb(m, loginmsg)) != 0)
 		fatal("%s: buffer error: %s", __func__, ssh_err(r));
+	sshbuf_reset(loginmsg);
 
 	mm_request_send(sock, MONITOR_ANS_PAM_ACCOUNT, m);