diff --git a/modules/repository/branch.go b/modules/repository/branch.go
index 2bf9930f19..98f1eec2f5 100644
--- a/modules/repository/branch.go
+++ b/modules/repository/branch.go
@@ -41,11 +41,14 @@ func SyncRepoBranchesWithRepo(ctx context.Context, repo *repo_model.Repository,
 	if err != nil {
 		return 0, fmt.Errorf("GetObjectFormat: %w", err)
 	}
-	_, err = db.GetEngine(ctx).ID(repo.ID).Update(&repo_model.Repository{ObjectFormatName: objFmt.Name()})
-	if err != nil {
-		return 0, fmt.Errorf("UpdateRepository: %w", err)
+
+	if repo.ObjectFormatName != objFmt.Name() {
+		repo.ObjectFormatName = objFmt.Name()
+		_, err = db.GetEngine(ctx).ID(repo.ID).NoAutoTime().Update(&repo_model.Repository{ObjectFormatName: objFmt.Name()})
+		if err != nil {
+			return 0, fmt.Errorf("UpdateRepository: %w", err)
+		}
 	}
-	repo.ObjectFormatName = objFmt.Name() // keep consistent with db
 
 	allBranches := container.Set[string]{}
 	{