diff --git a/protos/Makefile b/protos/Makefile
index aa5f8da..6ee661b 100644
--- a/protos/Makefile
+++ b/protos/Makefile
@@ -28,7 +28,7 @@
 all: googleapis libopenoltapi.a
 
 libopenoltapi.a: $(OBJS)
-	ar ru $@ $^
+	ar cr $@ $^
 	ranlib $@
 
 googleapis:
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 {