diff --git a/channels/sip/reqresp_parser.c b/channels/sip/reqresp_parser.c
index 1541d7c25b..298b8cb950 100644
--- a/channels/sip/reqresp_parser.c
+++ b/channels/sip/reqresp_parser.c
@@ -2420,7 +2420,7 @@ struct sip_via *parse_via(const char *header)
 
 	/* store the port, we have to handle ipv6 addresses containing ':'
 	 * characters gracefully */
-	if (((parm = strchr(v->sent_by, ']')) && *(++parm) == ':') || (parm = strchr(v->sent_by, ':'))) {
+	if (((parm = strchr(v->sent_by, ']')) && *(++parm) == ':') || (!(parm = strchr(v->sent_by, ']')) && (parm = strchr(v->sent_by, ':')))) {
 		char *endptr;
 
 		v->port = strtol(++parm, &endptr, 10);