diff --git a/config.scm b/config.scm
index ae8cecb..1441b7f 100644
--- a/config.scm
+++ b/config.scm
@@ -3,6 +3,7 @@
 (use-modules
  (gnu)
  (gnu image)
+ (gnu services authentication)
  (gnu services avahi)
  (gnu services base)
  (gnu services dbus)