diff --git a/platform/lang-impl/src/com/intellij/psi/impl/file/impl/PsiVFSListener.java b/platform/lang-impl/src/com/intellij/psi/impl/file/impl/PsiVFSListener.java
index 271708941e0a..f85e73dbdad9 100644
--- a/platform/lang-impl/src/com/intellij/psi/impl/file/impl/PsiVFSListener.java
+++ b/platform/lang-impl/src/com/intellij/psi/impl/file/impl/PsiVFSListener.java
@@ -78,7 +78,10 @@ public class PsiVFSListener extends VirtualFileAdapter {
 
         // let PushedFilePropertiesUpdater process all pending vfs events and update file properties before we issue PSI events
         for (Project project : projects) {
-          ((PushedFilePropertiesUpdaterImpl)PushedFilePropertiesUpdater.getInstance(project)).processAfterVfsChanges(events);
+          PushedFilePropertiesUpdater updater = PushedFilePropertiesUpdater.getInstance(project);
+          if (updater instanceof PushedFilePropertiesUpdaterImpl) { // false in upsource
+            ((PushedFilePropertiesUpdaterImpl)updater).processAfterVfsChanges(events);
+          }
         }
         for (Project project : projects) {
           PsiVFSListener listener = project.getComponent(PsiVFSListener.class);