diff --git a/app/models/project.rb b/app/models/project.rb
index aec7872..8b1f2f4 100644
--- a/app/models/project.rb
+++ b/app/models/project.rb
@@ -311,6 +311,7 @@ class Project < ActiveRecord::Base
     @start_date = nil
     @due_date = nil
     @override_members = nil
+    @assignable_users = nil
     base_reload(*args)
   end