diff --git a/src/proto/callbacks.proto b/src/proto/callbacks.proto
index 1114dc10b14..b75a19bb17d 100644
--- a/src/proto/callbacks.proto
+++ b/src/proto/callbacks.proto
@@ -86,7 +86,8 @@ message Callback {
     CallbackPerturbWeights perturb_weights = 52;
     CallbackExportOnnx export_onnx = 53;
     CallbackAlternateUpdates alternate_updates = 54;
-    CallbackMlperfLogging mlperf_logging = 55;
+    CallbackMlperfLogging mlperf_logging = 56;
+}
 
   message CallbackLTFB {
     int64 batch_interval = 1;