tracker/udp/server/server.go | 2 +-

diff --git a/tracker/udp/server/server.go b/tracker/udp/server/server.go
index 20e827b9737bbecb614622edfb22eaeb2a09f21e..c3179ae0bea27de36b0c1d44cffae645a44c7a4c 100644
--- a/tracker/udp/server/server.go
+++ b/tracker/udp/server/server.go
@@ -82,7 +82,7 @@ 		err = fmt.Errorf("checking conn id: %w", err)
 		return err
 	}
 	if !ok {
-		return fmt.Errorf("invalid connection id: %v", connId)
+		return fmt.Errorf("incorrect connection id: %x", connId)
 	}
 	var req udp.AnnounceRequest
 	err = udp.Read(r, &req)