diff --git a/channels/chan_sip.c b/channels/chan_sip.c
index d168e2846d..24af559fe8 100755
--- a/channels/chan_sip.c
+++ b/channels/chan_sip.c
@@ -3746,7 +3746,7 @@ static void initreqprep(struct sip_request *req, struct sip_pvt *p, char *cmd, c
 		l = p->owner->cid.cid_num;
 		n = p->owner->cid.cid_name;
 	}
-	if ((!l || !ast_isphonenumber(l)) && default_callerid[0])
+	if (!l || (!ast_isphonenumber(l) && default_callerid[0]))
 			l = default_callerid;
 	/* if user want's his callerid restricted */
 	if (p->callingpres & AST_PRES_PROHIB_USER_NUMBER_NOT_SCREENED) {