diff --git a/app/models/spree/payment_method.rb b/app/models/spree/payment_method.rb
index 50ea9da5e0..26eec433a0 100644
--- a/app/models/spree/payment_method.rb
+++ b/app/models/spree/payment_method.rb
@@ -93,10 +93,6 @@ module Spree
     end
 
     def init
-      unless _reflections.key?(:calculator)
-        self.class.include Spree::Core::CalculatedAdjustments
-      end
-
       self.calculator ||= ::Calculator::FlatRate.new(preferred_amount: 0)
     end