diff --git a/app/controllers/spree/admin/general_settings_controller.rb b/app/controllers/spree/admin/general_settings_controller.rb
index 21067ab1df..6ca68a2a4a 100644
--- a/app/controllers/spree/admin/general_settings_controller.rb
+++ b/app/controllers/spree/admin/general_settings_controller.rb
@@ -10,13 +10,7 @@ module Spree
       end
 
       def update
-        available_units = []
-        params.each do |name, value|
-          if value == "1" && unit = name.match(/available_units_(.*)/)&.captures&.first
-            available_units << unit
-          end
-        end
-        Spree::Config[:available_units] = available_units.join(",")
+        combine_available_units_params
         params.each do |name, value|
           next unless Spree::Config.has_preference? name
 
@@ -26,6 +20,18 @@ module Spree
 
         redirect_to spree.edit_admin_general_settings_path
       end
+
+      private
+
+      def combine_available_units_params
+        available_units = []
+        params.each do |name, value|
+          if value == "1" && unit = name.match(/available_units_(.*)/)&.captures&.first
+            available_units << unit
+          end
+        end
+        params[:available_units] = available_units.join(",")
+      end
     end
   end
 end