diff --git a/platform/platform-impl/src/com/intellij/openapi/vfs/newvfs/RefreshSessionImpl.java b/platform/platform-impl/src/com/intellij/openapi/vfs/newvfs/RefreshSessionImpl.java
index e760233798d1..e2143dd43eea 100644
--- a/platform/platform-impl/src/com/intellij/openapi/vfs/newvfs/RefreshSessionImpl.java
+++ b/platform/platform-impl/src/com/intellij/openapi/vfs/newvfs/RefreshSessionImpl.java
@@ -110,9 +110,16 @@ public class RefreshSessionImpl extends RefreshSession {
     boolean haveEventsToFire = myFinishRunnable != null || !myEvents.isEmpty();
 
     if (!workQueue.isEmpty()) {
-      LocalFileSystemImpl fs = (LocalFileSystemImpl)LocalFileSystem.getInstance();
-      fs.markSuspiciousFilesDirty(workQueue);
-      FileWatcher watcher = fs.getFileWatcher();
+      final LocalFileSystem fileSystem = LocalFileSystem.getInstance();
+      final FileWatcher watcher;
+      if (fileSystem instanceof LocalFileSystemImpl) {
+        LocalFileSystemImpl fs = (LocalFileSystemImpl)fileSystem;
+        fs.markSuspiciousFilesDirty(workQueue);
+        watcher = fs.getFileWatcher();
+      }
+      else {
+        watcher = null;
+      }
 
       long t = 0;
       if (LOG.isDebugEnabled()) {
@@ -124,7 +131,7 @@ public class RefreshSessionImpl extends RefreshSession {
         if (myCancelled) break;
 
         NewVirtualFile nvf = (NewVirtualFile)file;
-        if (!myIsRecursive && (!myIsAsync || !watcher.isWatched(nvf))) {
+        if (!myIsRecursive && (!myIsAsync || (watcher != null && !watcher.isWatched(nvf)))) {
           // we're unable to definitely refresh synchronously by means of file watcher.
           nvf.markDirty();
         }