diff --git a/taiga/users/migrations/0010_auto_20150414_0936.py b/taiga/users/migrations/0010_auto_20150414_0936.py
new file mode 100644
index 00000000..96eb7581
--- /dev/null
+++ b/taiga/users/migrations/0010_auto_20150414_0936.py
@@ -0,0 +1,26 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import models, migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('users', '0009_auto_20150326_1241'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='user',
+            name='lang',
+            field=models.CharField(max_length=20, blank=True, null=True, default='', verbose_name='default language'),
+            preserve_default=True,
+        ),
+        migrations.AlterField(
+            model_name='user',
+            name='timezone',
+            field=models.CharField(max_length=20, blank=True, null=True, default='', verbose_name='default timezone'),
+            preserve_default=True,
+        ),
+    ]
diff --git a/taiga/users/models.py b/taiga/users/models.py
index 3c4af001..dc4eb862 100644
--- a/taiga/users/models.py
+++ b/taiga/users/models.py
@@ -116,9 +116,9 @@ class User(AbstractBaseUser, PermissionsMixin):
                              max_length=500, null=True, blank=True,
                              verbose_name=_("photo"))
     date_joined = models.DateTimeField(_('date joined'), default=timezone.now)
-    lang = models.CharField(max_length=20, null=False, blank=True, default="",
+    lang = models.CharField(max_length=20, null=True, blank=True, default="",
                             verbose_name=_("default language"))
-    timezone = models.CharField(max_length=20, null=False, blank=True, default="",
+    timezone = models.CharField(max_length=20, null=True, blank=True, default="",
                                 verbose_name=_("default timezone"))
     colorize_tags = models.BooleanField(null=False, blank=True, default=False,
                                         verbose_name=_("colorize tags"))