diff --git a/core/grpc_service.go b/core/grpc_service.go
index 3981aed..ac0c57d 100644
--- a/core/grpc_service.go
+++ b/core/grpc_service.go
@@ -105,6 +105,7 @@
 	resp.IntfId = msg.IntfId
 	resp.OnuId = msg.OnuId
 	resp.Pkt = make([]byte, len(msg.Pkt))
+	copy(resp.Pkt, msg.Pkt)
 	s.omciOut <- resp
 	return new(openolt.Empty), nil
 }