Index: channels/chan_sip.c
===================================================================
--- channels/chan_sip.c	(revision 290862)
+++ channels/chan_sip.c	(working copy)
@@ -3102,6 +3102,9 @@
 static int peer_is_marked(void *peerobj, void *arg, int flags)
 {
 	struct sip_peer *peer = peerobj;
+	if (peer->the_mark && peer->pokeexpire != -1) {
+		AST_SCHED_DEL(sched, peer->pokeexpire);
+	}
 	return peer->the_mark ? CMP_MATCH : 0;
 }