diff --git a/java/idea-ui/src/com/intellij/openapi/roots/ui/configuration/libraryEditor/DefaultLibraryRootsComponentDescriptor.java b/java/idea-ui/src/com/intellij/openapi/roots/ui/configuration/libraryEditor/DefaultLibraryRootsComponentDescriptor.java
index db5f76353b1c..b775e13e1e34 100644
--- a/java/idea-ui/src/com/intellij/openapi/roots/ui/configuration/libraryEditor/DefaultLibraryRootsComponentDescriptor.java
+++ b/java/idea-ui/src/com/intellij/openapi/roots/ui/configuration/libraryEditor/DefaultLibraryRootsComponentDescriptor.java
@@ -105,7 +105,7 @@ public class DefaultLibraryRootsComponentDescriptor extends LibraryRootsComponen
     }
   }
 
-  private class AttachSourcesDescriptor extends ChooserBasedAttachRootButtonDescriptor {
+  private static class AttachSourcesDescriptor extends ChooserBasedAttachRootButtonDescriptor {
     private AttachSourcesDescriptor() {
       super(OrderRootType.SOURCES, ProjectBundle.message("module.libraries.attach.sources.button"));
     }