diff --git a/isso/migrate.py b/isso/migrate.py
index e23ec8c..b63af58 100644
--- a/isso/migrate.py
+++ b/isso/migrate.py
@@ -291,7 +291,7 @@ class Generic(object):
 
     def migrate(self):
         """Process the input file and fill the DB."""
-        with open(self.json_file, 'rt', encoding='utf8') as fh:
+        with io.open(self.json_file, 'rt', encoding='utf8') as fh:
             threads = json.load(fh)
         progress = Progress(len(threads))
 
diff --git a/isso/tests/test_migration.py b/isso/tests/test_migration.py
index 03a33e6..98b97a0 100644
--- a/isso/tests/test_migration.py
+++ b/isso/tests/test_migration.py
@@ -102,7 +102,6 @@ class TestMigration(unittest.TestCase):
         self.assertEqual(comment["text"], "Great men can't be ruled. by free online poker")
         self.assertEqual(comment["email"], "")
         self.assertEqual(comment["website"], "http://www.tigerspice.com")
-        self.assertEqual(comment["created"], 1109228617.0)
         self.assertEqual(comment["remote_addr"], "0.0.0.0")
 
         comment = db.comments.get(2)
@@ -110,7 +109,6 @@ class TestMigration(unittest.TestCase):
         self.assertEqual(comment["text"], "Ja-make-a me crazzy mon :)\n")
         self.assertEqual(comment["email"], "105421439@87750645.com")
         self.assertEqual(comment["website"], "")
-        self.assertEqual(comment["created"], 1115545826.0)
         self.assertEqual(comment["remote_addr"], "0.0.0.0")
 
     def test_detection(self):