diff --git a/pagure/lib/model.py b/pagure/lib/model.py
index e1c7216..2e50fb8 100644
--- a/pagure/lib/model.py
+++ b/pagure/lib/model.py
@@ -673,6 +673,7 @@ class Issue(BASE):
             'assignee': self.assignee.to_json(
                 public=public) if self.assignee else None,
             'priority': self.priority,
+            'milestone': self.milestone,
         }
 
         comments = []