diff --git a/usr.sbin/ppp/chat.c b/usr.sbin/ppp/chat.c
index 04b26792978..daa52cd85a0 100644
--- a/usr.sbin/ppp/chat.c
+++ b/usr.sbin/ppp/chat.c
@@ -154,6 +154,11 @@ chat_UpdateSet(struct fdescriptor *d, fd_set *r, fd_set *w, fd_set *e, int *n)
     else {
       /* c->state = CHAT_EXPECT; */
       c->argptr = &arg_term;
+      /*
+	We have to clear the input buffer, because it contains output
+	from the previous (timed out) command.
+      */
+      c->bufstart = c->bufend;
     }
     c->TimedOut = 0;
   }