diff --git a/channels/chan_sip.c b/channels/chan_sip.c
index ebbafbeb6d..e4f95b7be3 100644
--- a/channels/chan_sip.c
+++ b/channels/chan_sip.c
@@ -11575,8 +11575,8 @@ static void receive_message(struct sip_pvt *p, struct sip_request *req)
 	struct ast_frame f;
 	const char *content_type = get_header(req, "Content-Type");
 
-	if (strcmp(content_type, "text/plain")) { /* No text/plain attachment */
-		transmit_response(p, "415 Unsupported Media Type", req); 
+	if (strncmp(content_type, "text/plain", strlen("text/plain"))) { /* No text/plain attachment */
+		transmit_response(p, "415 Unsupported Media Type", req); /* Good enough, or? */
 		if (!p->owner)
 			sip_scheddestroy(p, DEFAULT_TRANS_TIMEOUT);
 		return;