diff --git a/platform/lang-impl/src/com/intellij/ide/projectView/impl/ProjectViewPane.java b/platform/lang-impl/src/com/intellij/ide/projectView/impl/ProjectViewPane.java
index 59a5574c2b21..880a52185b5a 100644
--- a/platform/lang-impl/src/com/intellij/ide/projectView/impl/ProjectViewPane.java
+++ b/platform/lang-impl/src/com/intellij/ide/projectView/impl/ProjectViewPane.java
@@ -191,6 +191,11 @@ public class ProjectViewPane extends AbstractProjectViewPSIPane {
     public boolean isShowExcludedFiles() {
       return myShowExcludedFiles;
     }
+
+    @Override
+    public boolean isToBuildChildrenInBackground(Object element) {
+      return true;
+    }
   }
 
   private final class ShowExcludedFilesAction extends ToggleAction implements DumbAware {