diff --git a/asg_form/Controllers/AssignmentController.cs b/asg_form/Controllers/AssignmentController.cs
index 54b1251..6bf8c89 100644
--- a/asg_form/Controllers/AssignmentController.cs
+++ b/asg_form/Controllers/AssignmentController.cs
@@ -19,6 +19,7 @@ using Mirai.Net.Sessions.Http.Managers;
 using Mirai.Net.Utils.Scaffolds;
 using Flandre.Core.Messaging.Segments;
 using Flandre.Core.Messaging;
+using Flandre.Core.Common;
 
 namespace asg_form.Controllers
 {