diff --git a/plugin.rb b/plugin.rb
index d353768..4e67504 100644
--- a/plugin.rb
+++ b/plugin.rb
@@ -115,6 +115,21 @@ after_initialize do
     end
   end
 
+  [
+    'donations_cause',
+    'donations_total',
+    'donations_month',
+    'donations_backers',
+    'donations_show_amounts',
+    'donations_maintainers',
+    'donations_maintainers_label',
+    'donations_github',
+    'donations_meta'
+  ].each do |key|
+    Site.preloaded_category_custom_fields << key if Site.respond_to? :preloaded_category_custom_fields
+  end
+
+
   add_to_serializer(:basic_category, :donations_cause) { object.donations_cause }
   add_to_serializer(:basic_category, :donations_total) { object.donations_total }
   add_to_serializer(:basic_category, :include_donations_total?) { object.donations_show_amounts }