diff --git a/compiler/circlechef/proto/circlechef.proto b/compiler/circlechef/proto/circlechef.proto
index 0ae5b07c5e9..c2db55a9d84 100644
--- a/compiler/circlechef/proto/circlechef.proto
+++ b/compiler/circlechef/proto/circlechef.proto
@@ -91,9 +91,9 @@ message Operation {
   repeated string input = 2;
   repeated string output = 3;
   optional int32 version = 4 [default = 1];
-  optional string extype = 5;
-  optional string custom_code = 6;
+  optional string custom_code = 5;
 
+  optional string extype = 99;
   optional BatchMatMulOptions batch_matmul_options = 100;
   optional InstanceNormOptions instance_norm_options = 101;
   optional BCQFullyConnectedOptions bcq_fully_connected_options = 102;