diff --git a/plugins/groovy/src/org/jetbrains/plugins/groovy/util/LightCacheKey.java b/plugins/groovy/src/org/jetbrains/plugins/groovy/util/LightCacheKey.java
index ccff1ff694e7..53003fe98bd2 100644
--- a/plugins/groovy/src/org/jetbrains/plugins/groovy/util/LightCacheKey.java
+++ b/plugins/groovy/src/org/jetbrains/plugins/groovy/util/LightCacheKey.java
@@ -4,7 +4,6 @@ import com.intellij.openapi.util.Key;
 import com.intellij.openapi.util.Pair;
 import com.intellij.openapi.util.UserDataHolderEx;
 import com.intellij.psi.PsiElement;
-import com.intellij.psi.PsiFile;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
@@ -75,7 +74,7 @@ public class LightCacheKey<T> {
     return new LightCacheKey<T>() {
       @Override
       protected long getModificationCount(PsiElement holder) {
-        return ((PsiFile)holder).getModificationStamp();
+        return holder.getContainingFile().getModificationStamp();
       }
     };
   }