diff --git a/src/controllers/GroupsController.ts b/src/controllers/GroupsController.ts
index 64a7e81..2393a49 100644
--- a/src/controllers/GroupsController.ts
+++ b/src/controllers/GroupsController.ts
@@ -527,7 +527,8 @@ export class GroupsController {
 		// Cancel group invitation
 		await GroupsHelper.DeleteMember(groupID, userID);
 
-		// TODO : delete related notifications
+		// Delete related notifications
+		await NotificationsHelper.DeleteNotificationsGroupsMembership(userID, groupID);
 
 		h.success("Membership invitation has been cancelled!");
 	}