diff --git a/lib/active_model/serializer/adapter.rb b/lib/active_model/serializer/adapter.rb
index fc942755..5d33650e 100644
--- a/lib/active_model/serializer/adapter.rb
+++ b/lib/active_model/serializer/adapter.rb
@@ -87,7 +87,7 @@ module ActiveModel
       end
 
       def include_meta(json)
-        json[meta_key] = meta if meta && root
+        json[meta_key] = meta if meta
         json
       end
     end
diff --git a/lib/active_model/serializer/adapter/flatten_json.rb b/lib/active_model/serializer/adapter/flatten_json.rb
index 17cff8f5..87b3ea8c 100644
--- a/lib/active_model/serializer/adapter/flatten_json.rb
+++ b/lib/active_model/serializer/adapter/flatten_json.rb
@@ -6,10 +6,6 @@ module ActiveModel
           super
           @result
         end
-
-        def root
-          false
-        end
       end
     end
   end