diff --git a/xpcom/glue/nsCycleCollectionParticipant.h b/xpcom/glue/nsCycleCollectionParticipant.h
index 0e0e4b608a..0959a4a648 100644
--- a/xpcom/glue/nsCycleCollectionParticipant.h
+++ b/xpcom/glue/nsCycleCollectionParticipant.h
@@ -910,6 +910,20 @@ static NS_CYCLE_COLLECTION_INNERCLASS NS_CYCLE_COLLECTION_INNERNAME;
 
 #define NS_CYCLE_COLLECTION_NOTE_EDGE_NAME CycleCollectionNoteEdgeName
 
+/**
+ * Convenience macros for defining nISupports methods in a cycle collected class.
+ */
+
+#define NS_IMPL_QUERY_INTERFACE_CYCLE_COLLECTION_INHERITED(aClass, aSuper, ...) \
+  NS_INTERFACE_TABLE_HEAD_CYCLE_COLLECTION_INHERITED(aClass)                    \
+  NS_INTERFACE_TABLE_INHERITED(aClass, __VA_ARGS__)                             \
+  NS_INTERFACE_TABLE_TAIL_INHERITING(aSuper)
+
+#define NS_IMPL_ISUPPORTS_CYCLE_COLLECTION_INHERITED(aClass, aSuper, ...)         \
+  NS_IMPL_QUERY_INTERFACE_CYCLE_COLLECTION_INHERITED(aClass, aSuper, __VA_ARGS__) \
+  NS_IMPL_ADDREF_INHERITED(aClass, aSuper)                                        \
+  NS_IMPL_RELEASE_INHERITED(aClass, aSuper)
+
 // *** Fast IID comparison helper functions ***
 /**
  * Equivalency of the high three words where two IIDs have the same