diff --git a/docs/changelog.rst b/docs/changelog.rst
index ea55d54..9c7e187 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -1,6 +1,7 @@
 Changelog
 =========
 
+* :support:`-` make tests in osusers.tests work again
 * :support:`-` minor HTML improvements
 * :support:`-` add API for gvafile task set_file_ssh_authorized_keys (requires
   gvafile >= 0.5.0 on the fileserver side)
diff --git a/gnuviechadmin/ldaptasks/tasks.py b/gnuviechadmin/ldaptasks/tasks.py
index d7fed5c..72acd8d 100644
--- a/gnuviechadmin/ldaptasks/tasks.py
+++ b/gnuviechadmin/ldaptasks/tasks.py
@@ -52,7 +52,7 @@ def create_ldap_user(username, uid, gid, gecos, homedir, shell, password):
 
 
 @shared_task
-def set_ldap_user_password(self, username, password):
+def set_ldap_user_password(username, password):
     """
     This task sets the password of an existing :py:class:`LDAP user
     <ldapentities.models.LdapUser>`.
diff --git a/gnuviechadmin/osusers/tests/test_admin.py b/gnuviechadmin/osusers/tests/test_admin.py
index 8e49ccb..405116f 100644
--- a/gnuviechadmin/osusers/tests/test_admin.py
+++ b/gnuviechadmin/osusers/tests/test_admin.py
@@ -3,7 +3,9 @@ from django.contrib.admin import AdminSite
 from django.test import TestCase
 from django.test.utils import override_settings
 
-from mock import patch, Mock
+from django.contrib.auth import get_user_model
+
+from mock import Mock
 
 from osusers.models import (
     Group,
@@ -16,31 +18,24 @@ from osusers.admin import (
     UserCreationForm,
 )
 
+Customer = get_user_model()
 
-class TaskResultInlineTest(TestCase):
+
+class CustomerTestCase(TestCase):
     def setUp(self):
-        self.site = AdminSite()
-        super(TaskResultInlineTest, self).setUp()
-
-    def test_get_queryset_calls_update_taskstatus(self):
-        with patch('osusers.admin.admin.TabularInline.get_queryset') as mock:
-            entrymock = Mock(name='entry')
-            mock.return_value = [entrymock]
-            requestmock = Mock(name='request')
-            UserTaskResultInline(User, self.site).get_queryset(requestmock)
-            entrymock.update_taskstatus.assert_calledwith()
-
-    def test_has_add_permissions_returns_false(self):
-        self.assertFalse(
-            UserTaskResultInline(User, self.site).has_add_permission(
-                self, Mock(name='request'))
-        )
+        self.customer = Customer.objects.create_user('test')
+        super(CustomerTestCase, self).setUp()
 
 
-class UserCreationFormTest(TestCase):
+class UserCreationFormTest(CustomerTestCase):
+
     def test_clean_password2_same(self):
         form = UserCreationForm()
-        form.cleaned_data = {'password1': 'secret', 'password2': 'secret'}
+        form.cleaned_data = {
+            'customer': self.customer,
+            'password1': 'secret',
+            'password2': 'secret'
+        }
         self.assertEqual(form.clean_password2(), 'secret')
 
     def test_clean_password2_empty(self):
@@ -50,7 +45,11 @@ class UserCreationFormTest(TestCase):
 
     def test_clean_password2_mismatch(self):
         form = UserCreationForm()
-        form.cleaned_data = {'password1': 'secretx', 'password2': 'secrety'}
+        form.cleaned_data = {
+            'customer': self.customer,
+            'password1': 'secretx',
+            'password2': 'secrety'
+        }
         with self.assertRaises(forms.ValidationError) as cm:
             form.clean_password2()
         self.assertEqual(cm.exception.message, PASSWORD_MISMATCH_ERROR)
@@ -62,7 +61,11 @@ class UserCreationFormTest(TestCase):
     )
     def test_save_commit(self):
         form = UserCreationForm()
-        form.cleaned_data = {'password1': 'secret', 'password2': 'secret'}
+        form.cleaned_data = {
+            'customer': self.customer,
+            'password1': 'secret',
+            'password2': 'secret'
+        }
         user = form.save()
         self.assertIsNotNone(user)
         self.assertEqual(User.objects.get(pk=user.uid), user)
@@ -72,7 +75,7 @@ class UserCreationFormTest(TestCase):
         self.assertIsNone(form.save_m2m())
 
 
-class UserAdminTest(TestCase):
+class UserAdminTest(CustomerTestCase):
     def setUp(self):
         site = AdminSite()
         self.uadmin = UserAdmin(User, site)
@@ -91,11 +94,12 @@ class UserAdminTest(TestCase):
         BROKER_BACKEND='memory'
     )
     def test_get_form_with_object(self):
-        user = User.objects.create_user()
+        user = User.objects.create_user(customer=self.customer)
         form = self.uadmin.get_form(Mock(name='request'), user)
         self.assertEqual(
             form.Meta.fields,
-            ['username', 'group', 'gecos', 'homedir', 'shell', 'uid']
+            ['username', 'group', 'gecos', 'homedir', 'shell', 'customer',
+             'uid']
         )
 
     def test_get_inline_instances_without_object(self):
@@ -108,7 +112,7 @@ class UserAdminTest(TestCase):
         BROKER_BACKEND='memory'
     )
     def test_get_inline_instances_with_object(self):
-        user = User.objects.create_user()
+        user = User.objects.create_user(customer=self.customer)
         inlines = self.uadmin.get_inline_instances(
             Mock(name='request'), user)
         self.assertEqual(len(inlines), len(UserAdmin.inlines))
@@ -138,27 +142,3 @@ class GroupAdminTest(TestCase):
         self.assertEqual(len(inlines), len(GroupAdmin.inlines))
         for index in range(len(inlines)):
             self.assertIsInstance(inlines[index], GroupAdmin.inlines[index])
-
-
-class DeleteTaskResultAdminTest(TestCase):
-    def setUp(self):
-        site = AdminSite()
-        self.dtradmin = DeleteTaskResultAdmin(DeleteTaskResult, site)
-        super(DeleteTaskResultAdminTest, self).setUp()
-
-    def test_has_add_permission_returns_false_without_object(self):
-        self.assertFalse(
-            self.dtradmin.has_add_permission(Mock(name='request')))
-
-    def test_has_add_permission_returns_false_with_object(self):
-        self.assertFalse(
-            self.dtradmin.has_add_permission(Mock(name='request'),
-                                             Mock(name='test')))
-
-    def test_get_queryset_calls_update_taskstatus(self):
-        with patch('osusers.admin.admin.ModelAdmin.get_queryset') as mock:
-            entrymock = Mock(name='entry')
-            mock.return_value = [entrymock]
-            requestmock = Mock(name='request')
-            self.dtradmin.get_queryset(requestmock)
-            entrymock.update_taskstatus.assert_calledwith()