diff --git a/sim_tmxr.c b/sim_tmxr.c
index e81515cc..d81e366f 100644
--- a/sim_tmxr.c
+++ b/sim_tmxr.c
@@ -1232,7 +1232,7 @@ for (i = 0; i < mp->lines; i++) {                       /* check each line in se
                         ++mp->sessions;                             /* count the new session */
 
                         if (lp->destination) {                      /* Virtual Null Modem Cable? */
-                            char host[CBUFSIZE];
+                            char host[sizeof(msg) - 64];
 
                             if (sim_parse_addr (lp->destination, host, sizeof(host), NULL, NULL, 0, NULL, address)) {
                                 tmxr_msg (newsock, "Rejecting connection from unexpected source\r\n");