diff --git a/ldapcherry/__init__.py b/ldapcherry/__init__.py
index 5968a3a..c119f92 100644
--- a/ldapcherry/__init__.py
+++ b/ldapcherry/__init__.py
@@ -332,8 +332,10 @@ class LdapCherry(object):
                 if not u in ret:
                     ret[u] = {}
                 for attr in tmp[u]:
-                    if not attr in ret[u]:
-                        ret[u][attr] = tmp[u][attr]
+                    if attr in self.attributes.backend_attributes[b]:
+                        attrid = self.attributes.backend_attributes[b][attr]
+                        if not attr in ret[u]:
+                            ret[u][attrid] = tmp[u][attr]
         return ret
 
     def _check_admin(self):
diff --git a/ldapcherry/attributes.py b/ldapcherry/attributes.py
index 860cae9..1c3abfb 100644
--- a/ldapcherry/attributes.py
+++ b/ldapcherry/attributes.py
@@ -48,8 +48,8 @@ class Attributes:
             for b in attr['backends']:
                 self.backends.add(b)
                 if b not in self.backend_attributes:
-                    self.backend_attributes[b] = []
-                self.backend_attributes[b].append(attr['backends'][b])
+                    self.backend_attributes[b] = {}
+                self.backend_attributes[b][attr['backends'][b]] = attrid
             if 'search_displayed' in attr and attr['search_displayed']:
                 self.displayed_attributes[attrid] = attr
 
@@ -78,7 +78,7 @@ class Attributes:
     def get_backend_attributes(self, backend):
         if backend not in self.backends:
             raise WrongBackend(backend)
-        return self.backend_attributes[backend]
+        return self.backend_attributes[backend].keys()
 
     def get_backend_key(self, backend):
         if backend not in self.backends:
diff --git a/tests/test_Attributes.py b/tests/test_Attributes.py
index acabfd0..c5a9f9b 100644
--- a/tests/test_Attributes.py
+++ b/tests/test_Attributes.py
@@ -39,7 +39,7 @@ class TestError(object):
     def testGetBackendAttributes(self):
         inv = Attributes('./tests/cfg/attributes.yml')
         ret = inv.get_backend_attributes('ldap')
-        expected = ['shell', 'cn', 'uid', 'uidNumber', 'gidNumber', 'home', 'userPassword', 'givenName', 'email', 'sn']
+        expected = ['shell', 'cn', 'userPassword', 'uidNumber', 'gidNumber', 'sn', 'home', 'givenName', 'email', 'uid']
         assert ret == expected
 
     def testGetKey(self):