diff --git a/Sugar/Collections/HashSet.pas b/Sugar/Collections/HashSet.pas
index d58079dc..b551a2e6 100644
--- a/Sugar/Collections/HashSet.pas
+++ b/Sugar/Collections/HashSet.pas
@@ -13,6 +13,7 @@ interface
     method Contains(Item: T): Boolean;
     method &Remove(Item: T): Boolean;
     method ForEach(Action: Action<T>);
+    method ToArray(); mapped to {$IF COOPER OR ECHOES}ToArray{$ELSE}objectEnumerator().allObjects{$ENDIF};
 
     method Intersect(&Set: HashSet<T>);
     method &Union(&Set: HashSet<T>);