diff --git a/protos/openolt.proto b/protos/openolt.proto
index 81ae2df..f87d8a4 100644
--- a/protos/openolt.proto
+++ b/protos/openolt.proto
@@ -474,6 +474,7 @@
 message OnuActivationFailureIndication {
     fixed32 intf_id = 1;
     fixed32 onu_id = 2;
+    fixed32 fail_reason = 3;
 }
 
 message OnuProcessingErrorIndication {