diff --git a/user/src/com/google/gwt/user/client/ui/DisclosurePanel.java b/user/src/com/google/gwt/user/client/ui/DisclosurePanel.java
index 469061d..51c8855 100644
--- a/user/src/com/google/gwt/user/client/ui/DisclosurePanel.java
+++ b/user/src/com/google/gwt/user/client/ui/DisclosurePanel.java
@@ -26,6 +26,7 @@
 import com.google.gwt.event.shared.HandlerRegistration;
 import com.google.gwt.resources.client.ClientBundle;
 import com.google.gwt.resources.client.ImageResource;
+import com.google.gwt.resources.client.ImageResource.ImageOptions;
 import com.google.gwt.user.client.DOM;
 import com.google.gwt.user.client.Element;
 import com.google.gwt.user.client.Event;
@@ -56,6 +57,7 @@
     FiresDisclosureEvents, HasWidgets, HasAnimation,
     HasOpenHandlers<DisclosurePanel>, HasCloseHandlers<DisclosurePanel> {
   interface DefaultImages extends ClientBundle {
+    @ImageOptions(flipRtl = true)
     ImageResource disclosurePanelClosed();
 
     ImageResource disclosurePanelOpen();