diff --git a/main/channel.c b/main/channel.c
index a83de5b53b..74b00e73d0 100644
--- a/main/channel.c
+++ b/main/channel.c
@@ -1027,6 +1027,7 @@ static void free_cid(struct ast_callerid *cid)
 		free(cid->cid_ani);
 	if (cid->cid_rdnis)
 		free(cid->cid_rdnis);
+	cid->cid_dnid = cid->cid_num = cid->cid_name = cid->cid_ani = cid->cid_rdnis = NULL;
 }
 
 /*! \brief Free a channel structure */