diff --git a/test_db.py b/test_db.py
index 1268093..8c3a75f 100644
--- a/test_db.py
+++ b/test_db.py
@@ -1,43 +1,46 @@
 # Copyright (C) 2015  The Software Heritage developers
 # See the AUTHORS file at the top-level directory of this distribution
 # License: GNU General Public License version 3, or any later version
 # See top-level LICENSE file for more information
 
 import unittest
 
 from nose.tools import istest
 from nose.plugins.attrib import attr
 
 from .db_testing import DbTestFixture
+from swh.core.hashutil import hex_to_hash
 from swh.storage.db import Db
 
 
 @attr('db')
 class TestDb(DbTestFixture, unittest.TestCase):
 
     def setUp(self):
         super().setUp()
         self.db = Db(self.conn)
 
     def tearDown(self):
         self.db.conn.close()
         super().tearDown()
 
     @istest
     def add_content(self):
         cur = self.cursor
-        sha1 = '34973274ccef6ab4dfaaf86599792fa9c3fe4689'
+        sha1 = hex_to_hash('34973274ccef6ab4dfaaf86599792fa9c3fe4689')
         self.db.mktemp('content', cur)
         self.db.copy_to([{
             'sha1': sha1,
-            'sha1_git': 'd81cc0710eb6cf9efd5b920a8453e1e07157b6cd',
-            'sha256': '673650f936cb3b0a2f93ce09d81be10748b1b203'
-            'c19e8176b4eefc1964a0cf3a',
+            'sha1_git': hex_to_hash(
+                'd81cc0710eb6cf9efd5b920a8453e1e07157b6cd'),
+            'sha256': hex_to_hash(
+                '673650f936cb3b0a2f93ce09d81be107'
+                '48b1b203c19e8176b4eefc1964a0cf3a'),
             'length': 3}],
                         'tmp_content',
                         ['sha1', 'sha1_git', 'sha256', 'length'],
                         cur)
         self.db.content_add_from_temp(cur)
         self.cursor.execute('SELECT sha1 FROM content WHERE sha1 = %s',
                             (sha1,))
-        self.assertEqual(self.cursor.fetchone(), (sha1,))
+        self.assertEqual(self.cursor.fetchone()[0].tobytes(), sha1)