diff --git a/vispa/extensions/ldap_export/__init__.py b/vispa/extensions/ldap_export/__init__.py
index aec9d6f8c1665bf6b329143697758eed83db831b..e752357fcaedce6cfc2d13064885555aaf7d2fd2 100644
--- a/vispa/extensions/ldap_export/__init__.py
+++ b/vispa/extensions/ldap_export/__init__.py
@@ -193,9 +193,9 @@ class LDAPExportExtension(AbstractExtension):
                 session = scoped_session(sessionmaker(autoflush=True, autocommit=False))
                 session.configure(bind=self.server._engine)
                 if vispa.config("ldap-export", "delete_unknown", False):
-                    self.delete_unknown(session)
-                self.sync_all_users(session)
-                self.sync_all_groups(session)
+                    self.ldapexport.delete_unknown(session)
+                self.ldapexport.sync_all_users(session)
+                self.ldapexport.sync_all_groups(session)
 
             vispa.register_callback("user.activate", self.on_activate)
             vispa.register_callback("user.set_password", self.on_set_password)