diff --git a/core/app/models/spree/calculator/flexi_rate.rb b/core/app/models/spree/calculator/flexi_rate.rb
index b420cf50363..6f0d130acc1 100644
--- a/core/app/models/spree/calculator/flexi_rate.rb
+++ b/core/app/models/spree/calculator/flexi_rate.rb
@@ -8,6 +8,7 @@ class Calculator::FlexiRate < Calculator
     preference :currency,        :string,  default: ->{ Spree::Config[:currency] }
 
     def self.available?(_object)
+      Spree::Deprecation.warn('Spree::Calculator::FlexiRate::available is DEPRECATED. Use the instance method instead.')
       true
     end