diff --git a/ldapcherry/backend/backendAD.py b/ldapcherry/backend/backendAD.py
index 63b637a..6feb890 100644
--- a/ldapcherry/backend/backendAD.py
+++ b/ldapcherry/backend/backendAD.py
@@ -253,7 +253,10 @@
         if binddn is not None:
             ldap_client = self._connect()
             try:
-                ldap_client.simple_bind_s(self._str(binddn), self._str(password))
+                ldap_client.simple_bind_s(
+                    self._str(binddn),
+                    self._str(password)
+                )
             except ldap.INVALID_CREDENTIALS:
                 ldap_client.unbind_s()
                 return False