diff --git a/rtmp/rtmp.go b/rtmp/rtmp.go
index 2f537625..bb823f70 100644
--- a/rtmp/rtmp.go
+++ b/rtmp/rtmp.go
@@ -1297,6 +1297,7 @@ func C_HandleInvoke(r *C_RTMP, body *byte, nBodySize uint32) (ok bool) {
 		panic("Unsupported method av_playlist_ready")
 
 	default:
+		panic(fmt.Sprintf("unknown method: %q", method))
 	}
 leave:
 	C_AMF_Reset(&obj)