diff --git a/dom/icc/src/IccManager.cpp b/dom/icc/src/IccManager.cpp
index a1bc1db28de..a4142260e1d 100644
--- a/dom/icc/src/IccManager.cpp
+++ b/dom/icc/src/IccManager.cpp
@@ -36,6 +36,7 @@ NS_IMPL_CYCLE_COLLECTION_UNLINK_END
 
 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(IccManager)
   NS_INTERFACE_MAP_ENTRY(nsIDOMMozIccManager)
+  NS_INTERFACE_MAP_ENTRY(nsIObserver)
   NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIDOMMozIccManager)
   NS_DOM_INTERFACE_MAP_ENTRY_CLASSINFO(MozIccManager)
 NS_INTERFACE_MAP_END_INHERITING(nsDOMEventTargetHelper)