diff --git a/modules/git/repo.go b/modules/git/repo.go
index d4e1669be..1c223018a 100644
--- a/modules/git/repo.go
+++ b/modules/git/repo.go
@@ -7,7 +7,6 @@ package git
 import (
 	"bytes"
 	"context"
-	"errors"
 	"fmt"
 	"io"
 	"net/url"
@@ -63,32 +62,6 @@ func IsRepoURLAccessible(ctx context.Context, url string) bool {
 	return err == nil
 }
 
-// GetObjectFormatOfRepo returns the hash type of repository at a given path
-func GetObjectFormatOfRepo(ctx context.Context, repoPath string) (ObjectFormat, error) {
-	var stdout, stderr strings.Builder
-
-	err := NewCommand(ctx, "hash-object", "--stdin").Run(&RunOpts{
-		Dir:    repoPath,
-		Stdout: &stdout,
-		Stderr: &stderr,
-		Stdin:  &strings.Reader{},
-	})
-	if err != nil {
-		return nil, err
-	}
-
-	if stderr.Len() > 0 {
-		return nil, errors.New(stderr.String())
-	}
-
-	h, err := NewIDFromString(strings.TrimRight(stdout.String(), "\n"))
-	if err != nil {
-		return nil, err
-	}
-
-	return h.Type(), nil
-}
-
 // InitRepository initializes a new Git repository.
 func InitRepository(ctx context.Context, repoPath string, bare bool, objectFormatName string) error {
 	err := os.MkdirAll(repoPath, os.ModePerm)
diff --git a/modules/repository/branch.go b/modules/repository/branch.go
index e448490f4..a3fca7c7c 100644
--- a/modules/repository/branch.go
+++ b/modules/repository/branch.go
@@ -5,6 +5,7 @@ package repository
 
 import (
 	"context"
+	"fmt"
 
 	"code.gitea.io/gitea/models/db"
 	git_model "code.gitea.io/gitea/models/git"
@@ -36,6 +37,15 @@ func SyncRepoBranches(ctx context.Context, repoID, doerID int64) (int64, error)
 }
 
 func SyncRepoBranchesWithRepo(ctx context.Context, repo *repo_model.Repository, gitRepo *git.Repository, doerID int64) (int64, error) {
+	objFmt, err := gitRepo.GetObjectFormat()
+	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)
+	}
+
 	allBranches := container.Set[string]{}
 	{
 		branches, _, err := gitRepo.GetBranchNames(0, 0)
diff --git a/modules/repository/branch_test.go b/modules/repository/branch_test.go
new file mode 100644
index 000000000..acf75a1ac
--- /dev/null
+++ b/modules/repository/branch_test.go
@@ -0,0 +1,31 @@
+// Copyright 2024 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package repository
+
+import (
+	"testing"
+
+	"code.gitea.io/gitea/models/db"
+	git_model "code.gitea.io/gitea/models/git"
+	repo_model "code.gitea.io/gitea/models/repo"
+	"code.gitea.io/gitea/models/unittest"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestSyncRepoBranches(t *testing.T) {
+	assert.NoError(t, unittest.PrepareTestDatabase())
+	_, err := db.GetEngine(db.DefaultContext).ID(1).Update(&repo_model.Repository{ObjectFormatName: "bad-fmt"})
+	assert.NoError(t, db.TruncateBeans(db.DefaultContext, &git_model.Branch{}))
+	assert.NoError(t, err)
+	repo := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: 1})
+	assert.Equal(t, "bad-fmt", repo.ObjectFormatName)
+	_, err = SyncRepoBranches(db.DefaultContext, 1, 0)
+	assert.NoError(t, err)
+	repo = unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: 1})
+	assert.Equal(t, "sha1", repo.ObjectFormatName)
+	branch, err := git_model.GetBranch(db.DefaultContext, 1, "master")
+	assert.NoError(t, err)
+	assert.EqualValues(t, "master", branch.Name)
+}
diff --git a/services/repository/adopt.go b/services/repository/adopt.go
index 914cd9047..f4d0da67a 100644
--- a/services/repository/adopt.go
+++ b/services/repository/adopt.go
@@ -195,6 +195,10 @@ func adoptRepository(ctx context.Context, repoPath string, repo *repo_model.Repo
 	}
 	defer gitRepo.Close()
 
+	if _, err = repo_module.SyncRepoBranchesWithRepo(ctx, repo, gitRepo, 0); err != nil {
+		return fmt.Errorf("SyncRepoBranches: %w", err)
+	}
+
 	if err = repo_module.SyncReleasesWithTags(ctx, repo, gitRepo); err != nil {
 		return fmt.Errorf("SyncReleasesWithTags: %w", err)
 	}