1 files changed, 1 insertions, 1 deletions
diff --git a/lib/api/v3/milestones.rb b/lib/api/v3/milestones.rb
index 2a850a08a8a..be90cec4afc 100644
--- a/lib/api/v3/milestones.rb
+++ b/lib/api/v3/milestones.rb
@@ -18,7 +18,7 @@ module API
       params do
         requires :id, type: String, desc: 'The ID of a project'
       end
-      resource :projects do
+      resource :projects, requirements: { id: %r{[^/]+} } do
         desc 'Get a list of project milestones' do
           success ::API::Entities::Milestone
         end