diff --git a/internal/collections/infra/mysql_repo.go b/internal/collections/infra/mysql_repo.go
index 204920c4..ac09d6f0 100644
--- a/internal/collections/infra/mysql_repo.go
+++ b/internal/collections/infra/mysql_repo.go
@@ -128,7 +128,7 @@ func (r mysqlRepo) DeleteSubjectCollection(
 ) error {
 	_, err := r.q.SubjectCollection.WithContext(ctx).
 		Where(r.q.SubjectCollection.UserID.Eq(userID), r.q.SubjectCollection.SubjectID.Eq(subjectID)).
-		Delete()
+		UpdateSimple(r.q.SubjectCollection.Type.Value(0))
 	return err
 }