diff --git a/app/models/type/attributes.rb b/app/models/type/attributes.rb
index e9e14b85d172..f8383f7d533f 100644
--- a/app/models/type/attributes.rb
+++ b/app/models/type/attributes.rb
@@ -211,9 +211,14 @@ def active_custom_field_attributes
   ##
   # Returns whether the custom field is active in the given project.
   def custom_field_in_project?(attribute, project)
-    project
-      .all_work_package_custom_fields.pluck(:id)
-      .map { |id| "custom_field_#{id}" }
+    custom_fields_in_project = RequestStore.fetch(:"custom_field_in_project_#{project.id}") do
+      project
+        .all_work_package_custom_fields
+        .pluck(:id)
+        .map { |id| "custom_field_#{id}" }
+    end
+
+    custom_fields_in_project
       .include? attribute
   end
 end