diff --git a/platform/platform-api/src/com/intellij/ui/treeStructure/actions/ExpandAllAction.java b/platform/platform-api/src/com/intellij/ui/treeStructure/actions/ExpandAllAction.java
index 06500e7a4d4d..77db4a826fcd 100644
--- a/platform/platform-api/src/com/intellij/ui/treeStructure/actions/ExpandAllAction.java
+++ b/platform/platform-api/src/com/intellij/ui/treeStructure/actions/ExpandAllAction.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2000-2009 JetBrains s.r.o.
+ * Copyright 2000-2014 JetBrains s.r.o.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -18,10 +18,11 @@ package com.intellij.ui.treeStructure.actions;
 import com.intellij.icons.AllIcons;
 import com.intellij.openapi.actionSystem.AnAction;
 import com.intellij.openapi.actionSystem.AnActionEvent;
+import com.intellij.openapi.project.DumbAware;
 
 import javax.swing.*;
 
-public class ExpandAllAction extends AnAction {
+public class ExpandAllAction extends AnAction implements DumbAware {
 
   protected JTree myTree;