diff --git a/channels/chan_sip.c b/channels/chan_sip.c
index 07f738a15e..d8fe725a38 100644
--- a/channels/chan_sip.c
+++ b/channels/chan_sip.c
@@ -19531,7 +19531,7 @@ static struct ast_channel *sip_request_call(const char *type, int format, void *
 {
 	struct sip_pvt *p;
 	struct ast_channel *tmpc = NULL;
-	char *ext, *host;
+	char *ext = NULL, *host;
 	char tmp[256];
 	char *dest = data;
 	char *dnid;