diff --git a/src/main/java/com/googlesource/gerrit/plugins/reviewers/Action.java b/src/main/java/com/googlesource/gerrit/plugins/reviewers/Action.java
deleted file mode 100644
index 04a15fc..0000000
--- a/src/main/java/com/googlesource/gerrit/plugins/reviewers/Action.java
+++ /dev/null
@@ -1,20 +0,0 @@
-// Copyright (C) 2014 The Android Open Source Project
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package com.googlesource.gerrit.plugins.reviewers;
-
-public enum Action {
-  ADD,
-  REMOVE
-}
diff --git a/src/main/java/com/googlesource/gerrit/plugins/reviewers/PutReviewers.java b/src/main/java/com/googlesource/gerrit/plugins/reviewers/PutReviewers.java
index ccb57b7..00e9981 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/reviewers/PutReviewers.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/reviewers/PutReviewers.java
@@ -56,6 +56,11 @@
     public String reviewer;
   }
 
+  private enum Action {
+    ADD,
+    REMOVE
+  }
+
   private final String pluginName;
   private final ReviewersConfig config;
   private final Provider<MetaDataUpdate.User> metaDataUpdateFactory;