diff --git a/lib/sub_diff/adapter.rb b/lib/sub_diff/adapter.rb
index <HASH>..<HASH> 100644
--- a/lib/sub_diff/adapter.rb
+++ b/lib/sub_diff/adapter.rb
@@ -2,7 +2,7 @@ module SubDiff
   class Adapter
     extend Forwardable
 
-    def_delegators :@differ, :builder
+    def_delegators :differ, :builder
     def_delegators :builder, :type
     def_delegators :instance, :diff
Refer to method instead of ivar