diff --git a/platform/lang-impl/src/com/intellij/codeInsight/daemon/impl/IndentsPass.java b/platform/lang-impl/src/com/intellij/codeInsight/daemon/impl/IndentsPass.java
index e3b15476c683..8c467b7c6515 100644
--- a/platform/lang-impl/src/com/intellij/codeInsight/daemon/impl/IndentsPass.java
+++ b/platform/lang-impl/src/com/intellij/codeInsight/daemon/impl/IndentsPass.java
@@ -27,6 +27,7 @@ import com.intellij.openapi.editor.markup.RangeHighlighter;
 import com.intellij.openapi.fileTypes.FileType;
 import com.intellij.openapi.progress.ProgressIndicator;
 import com.intellij.openapi.progress.ProgressManager;
+import com.intellij.openapi.project.DumbAware;
 import com.intellij.openapi.project.Project;
 import com.intellij.openapi.util.Key;
 import com.intellij.openapi.util.Segment;
@@ -49,7 +50,7 @@ import java.util.Collections;
 import java.util.List;
 import java.util.Map;
 
-public class IndentsPass extends TextEditorHighlightingPass {
+public class IndentsPass extends TextEditorHighlightingPass implements DumbAware {
   private static final Key<List<RangeHighlighter>> INDENT_HIGHLIGHTERS_IN_EDITOR_KEY = Key.create("INDENT_HIGHLIGHTERS_IN_EDITOR_KEY");
   private static final Key<Long> LAST_TIME_INDENTS_BUILT = Key.create("LAST_TIME_INDENTS_BUILT");