diff --git a/platform/lang-impl/src/com/intellij/psi/impl/source/PsiFileImpl.java b/platform/lang-impl/src/com/intellij/psi/impl/source/PsiFileImpl.java
index dbca10b833aa..c78054c1ec27 100644
--- a/platform/lang-impl/src/com/intellij/psi/impl/source/PsiFileImpl.java
+++ b/platform/lang-impl/src/com/intellij/psi/impl/source/PsiFileImpl.java
@@ -76,7 +76,7 @@ public abstract class PsiFileImpl extends ElementBase implements PsiFileEx, PsiF
   protected PsiFile myOriginalFile = null;
   private final FileViewProvider myViewProvider;
   private static final Key<Document> HARD_REFERENCE_TO_DOCUMENT = new Key<Document>("HARD_REFERENCE_TO_DOCUMENT");
-  private final Object myStubLock = new String("file's stub lock");
+  private final Object myStubLock = new Object();
   private SoftReference<StubTree> myStub;
   protected final PsiManagerEx myManager;
   private volatile Object myTreeElementPointer; // SoftReference/WeakReference to RepositoryTreeElement when has repository id, RepositoryTreeElement otherwise