diff --git a/lib/api/entities.rb b/lib/api/entities.rb
index a206b7731e3..8b1ebb9c994 100644
--- a/lib/api/entities.rb
+++ b/lib/api/entities.rb
@@ -136,7 +136,8 @@ module API
       expose :author, :assignee, using: Entities::UserBasic
       expose :source_project_id, :target_project_id
       expose :label_names, as: :labels
-      expose :description, :milestone_id
+      expose :description
+      expose :milestone, using: Entities::Milestone
     end
 
     class SSHKey < Grape::Entity