diff --git a/protos/openolt.proto b/protos/openolt.proto
index 9fa9566..81ae2df 100644
--- a/protos/openolt.proto
+++ b/protos/openolt.proto
@@ -269,6 +269,7 @@
 message UplinkPacket {
     fixed32 intf_id = 1;
     bytes pkt = 2;
+    fixed32 flow_id = 3;
 }
 
 message DeviceInfo {