diff --git a/protos/voltha_protos/common.proto b/protos/voltha_protos/common.proto
index a0a4b81..25700f9 100644
--- a/protos/voltha_protos/common.proto
+++ b/protos/voltha_protos/common.proto
@@ -86,6 +86,7 @@
         OPERATION_SUCCESS = 0;
         OPERATION_FAILURE = 1;
         OPERATION_UNSUPPORTED = 2;
+        OPERATION_IN_PROGRESS = 3;
     }
     // Return code
     OperationReturnCode code = 1;