diff --git a/platform/lang-impl/src/com/intellij/openapi/roots/impl/RootIndex.java b/platform/lang-impl/src/com/intellij/openapi/roots/impl/RootIndex.java
index 73e475e22242..ae6009ca0915 100644
--- a/platform/lang-impl/src/com/intellij/openapi/roots/impl/RootIndex.java
+++ b/platform/lang-impl/src/com/intellij/openapi/roots/impl/RootIndex.java
@@ -337,6 +337,7 @@ class RootIndex {
       }
     }
 
+    myInfoCache.put(dir, DirectoryInfo.EMPTY);
     return null;
   }