diff --git a/telnet/telnet.c b/telnet/telnet.c
index c5b18c14..0211ffc6 100644
--- a/telnet/telnet.c
+++ b/telnet/telnet.c
@@ -858,7 +858,7 @@ suboption (void)
 	    }
 #endif /* defined(TN3270) */
 	  name = gettermname ();
-	  len = strlen (name) + 4 + 2;
+	  len = strlen (name) + 4 + 2 + 1;
 
 	  if ((len < NETROOM ()) && (len <= (int) sizeof (temp)))
 	    {