diff --git a/app/models/spree/gateway.rb b/app/models/spree/gateway.rb
index 4b7533c2d8..6a0320835b 100644
--- a/app/models/spree/gateway.rb
+++ b/app/models/spree/gateway.rb
@@ -28,7 +28,7 @@ module Spree
       gateway_options = options
       gateway_options.delete :login if gateway_options.key?(:login) && gateway_options[:login].nil?
       if gateway_options[:server]
-        ActiveMerchant::Billing::Base.gateway_mode = gateway_options[:server].to_sym
+        ActiveMerchant::Billing::Base.mode = gateway_options[:server].to_sym
       end
       @provider ||= provider_class.new(gateway_options)
     end