diff --git a/glicid/services/authentication.scm b/glicid/services/authentication.scm
index f4d4126..64025a1 100644
--- a/glicid/services/authentication.scm
+++ b/glicid/services/authentication.scm
@@ -26,7 +26,7 @@
     (default "stderr")
   )
   (sssd-debug-level sssd-debug-level
-    (default "")
+    (default #f)
   )
   (log-file log-file
     (default "/var/log/sssd/sssd.log")
@@ -48,10 +48,10 @@
             (list
               #$(file-append sssd-pkg "/sbin/sssd")
 ;              "--interactive"
-              (list (string-append "--config=" sssd-conf))
-              (list(string-append "--logger=" sssd-logger))
+              (string-append "--config=" sssd-conf)
+              (string-append "--logger=" sssd-logger)
               #$@(if sssd-debug-level
-                (list (string-append "--debug-level=" sssd-debug-level))
+                list (string-append "--debug-level=" sssd-debug-level)
                 '()
               )
             )