diff --git a/platform/duplicates-analysis/src/com/intellij/dupLocator/LightDuplicateProfile.java b/platform/duplicates-analysis/src/com/intellij/dupLocator/LightDuplicateProfile.java
index 193cae73f41f..73c776534908 100644
--- a/platform/duplicates-analysis/src/com/intellij/dupLocator/LightDuplicateProfile.java
+++ b/platform/duplicates-analysis/src/com/intellij/dupLocator/LightDuplicateProfile.java
@@ -17,6 +17,7 @@ package com.intellij.dupLocator;
 
 import com.intellij.lang.LighterAST;
 import com.intellij.lang.LighterASTNode;
+import com.intellij.openapi.vfs.VirtualFile;
 import org.jetbrains.annotations.NotNull;
 
 /**
@@ -24,6 +25,7 @@ import org.jetbrains.annotations.NotNull;
  */
 public interface LightDuplicateProfile {
   void process(@NotNull LighterAST ast, @NotNull Callback callback);
+  boolean acceptsFile(@NotNull VirtualFile file);
 
   interface Callback {
     void process(int hash, int hash2, @NotNull LighterAST ast, @NotNull LighterASTNode... nodes);
diff --git a/platform/duplicates-analysis/src/com/intellij/dupLocator/index/DuplicatesIndex.java b/platform/duplicates-analysis/src/com/intellij/dupLocator/index/DuplicatesIndex.java
index 683a9a8a53a9..fc3fcf34ac89 100644
--- a/platform/duplicates-analysis/src/com/intellij/dupLocator/index/DuplicatesIndex.java
+++ b/platform/duplicates-analysis/src/com/intellij/dupLocator/index/DuplicatesIndex.java
@@ -61,10 +61,16 @@ public class DuplicatesIndex extends FileBasedIndexExtension<Integer, TIntArrayL
   private final FileBasedIndex.InputFilter myInputFilter = new FileBasedIndex.InputFilter() {
     @Override
     public boolean acceptInput(@NotNull final VirtualFile file) {
-      return ourEnabled &&
-             findDuplicatesProfile(file.getFileType()) != null &&
-             file.isInLocalFileSystem() // skip library sources
-        ;
+      if (!ourEnabled ||
+          !file.isInLocalFileSystem()  // skip library sources
+         ) {
+        return false;
+      }
+      DuplicatesProfile duplicatesProfile = findDuplicatesProfile(file.getFileType());
+      if (duplicatesProfile instanceof LightDuplicateProfile) {
+        return ((LightDuplicateProfile)duplicatesProfile).acceptsFile(file);
+      }
+      return duplicatesProfile != null;
     }
   };
 
@@ -163,7 +169,7 @@ public class DuplicatesIndex extends FileBasedIndexExtension<Integer, TIntArrayL
 
   @Override
   public int getVersion() {
-    return myBaseVersion + (ourEnabled ? 0xFF : 0) + (ourEnabledLightProfiles ? 0x7F : 0) + (ourEnabledOldProfiles ? 0x21 : 0);
+    return myBaseVersion + (ourEnabled ? 0xFF : 0) + (ourEnabledLightProfiles ? 0x80 : 0) + (ourEnabledOldProfiles ? 0x21 : 0);
   }
 
   @Override