diff --git a/modoboa/core/tests.py b/modoboa/core/tests.py
index 481c9b2fc..369fad73f 100644
--- a/modoboa/core/tests.py
+++ b/modoboa/core/tests.py
@@ -80,7 +80,7 @@ class LDAPAuthenticationTestCase(ModoTestCase):
         parameters.save_admin("LDAP_AUTH_METHOD", "directbind")
         parameters.save_admin(
             "LDAP_USER_DN_TEMPLATE", "%(user)s,dc=example,dc=com")
-        username = "testuser@example.com"
+        username = "testuser2@example.com"
         self.assertTrue(self.client.login(username=username, password="test"))
         self.check_created_user(username)
 
diff --git a/test_data/base.ldif b/test_data/base.ldif
index f236cebbf..4cdab372b 100644
--- a/test_data/base.ldif
+++ b/test_data/base.ldif
@@ -3,7 +3,7 @@ objectClass: dcObject
 objectClass: organizationalUnit
 ou: users
 
-dn: mail=testuser@example.com,dc=example,dc=com
+dn: cn=testuser,dc=example,dc=com
 objectClass: inetOrgPerson
 objectClass: organizationalPerson
 objectClass: person
@@ -13,3 +13,14 @@ givenName: Test
 sn: User
 mail: testuser@example.com
 userPassword: {SSHA}AIzygLSXlArhAMzddUriXQxf7UlkqopP
+
+dn: mail=testuser2@example.com,dc=example,dc=com
+objectClass: inetOrgPerson
+objectClass: organizationalPerson
+objectClass: person
+objectClass: top
+cn: testuser
+givenName: Test
+sn: User
+mail: testuser2@example.com
+userPassword: {SSHA}AIzygLSXlArhAMzddUriXQxf7UlkqopP