diff --git a/lib/grape_entity/delegator/hash_object.rb b/lib/grape_entity/delegator/hash_object.rb
index aab555cc..27b30b66 100644
--- a/lib/grape_entity/delegator/hash_object.rb
+++ b/lib/grape_entity/delegator/hash_object.rb
@@ -5,6 +5,10 @@ class HashObject < Base
         def delegate(attribute)
           object[attribute]
         end
+
+        def delegatable?(attribute)
+          object.key? attribute
+        end
       end
     end
   end