diff --git a/rtmp/parseurl.go b/rtmp/parseurl.go
index cc197fb9..4fea7d82 100644
--- a/rtmp/parseurl.go
+++ b/rtmp/parseurl.go
@@ -99,16 +99,15 @@ func parseURL(addr string) (protocol int32, host string, port uint16, app, playp
 		}
 	}
 
-	if port == 0 {
-		switch {
-		case (protocol & featureSSL) != 0:
-			port = 433
-			return errUnimplemented
-		case (protocol & featureHTTP) != 0:
-			port = 80
-		default:
-			port = 1935
-		}
+	switch {
+	case port != 0:
+	case (protocol & featureSSL) != 0:
+		return protocol, host, port, app, playpath, errUnimplemented // port = 433
+	case (protocol & featureHTTP) != 0:
+		port = 80
+	default:
+		port = 1935
 	}
+
 	return protocol, host, port, app, playpath, nil
 }