diff --git a/manifests/params.pp b/manifests/params.pp
index 1d052ba..0d653ee 100644
--- a/manifests/params.pp
+++ b/manifests/params.pp
@@ -11,8 +11,8 @@ class nslcd::params {
   $ldap_version        = '3'
   $ldap_binddn         = undef
   $ldap_bindpw         = undef
-  $ldap_search_base    = ''
-  $ldap_group_base     = ''
+  $ldap_search_base    = undef
+  $ldap_group_base     = undef
   $ldap_search_scope   = 'subtree'
   $ldap_filters        = {}
   $ldap_ssl            = 'off'