diff --git a/www/includes/config.inc.php b/www/includes/config.inc.php
index 5e5d5d1..c1b23ae 100644
--- a/www/includes/config.inc.php
+++ b/www/includes/config.inc.php
@@ -33,7 +33,10 @@
  if (getenv('LDAP_ACCOUNT_ADDITIONAL_ATTRIBUTES')) { $LDAP['account_additional_attributes'] = getenv('LDAP_ACCOUNT_ADDITIONAL_ATTRIBUTES'); }
 
  if (getenv('LDAP_GROUP_MEMBERSHIP_ATTRIBUTE')) { $LDAP['group_membership_attribute'] = getenv('LDAP_GROUP_MEMBERSHIP_ATTRIBUTE'); }
- if (getenv('LDAP_GROUP_MEMBERSHIP_USES_UID') and strtoupper(getenv('LDAP_GROUP_MEMBERSHIP_USES_UID')) == TRUE )  { $LDAP['group_membership_uses_uid']  = TRUE; }
+ if (getenv('LDAP_GROUP_MEMBERSHIP_USES_UID') {
+   if (strtoupper(getenv('LDAP_GROUP_MEMBERSHIP_USES_UID')) == TRUE )  { $LDAP['group_membership_uses_uid']  = TRUE; }
+   if (strtoupper(getenv('LDAP_GROUP_MEMBERSHIP_USES_UID')) == FALSE )  { $LDAP['group_membership_uses_uid']  = FALSE; }
+ }
 
  $LDAP['require_starttls'] = ((strcasecmp(getenv('LDAP_REQUIRE_STARTTLS'),'TRUE') == 0) ? TRUE : FALSE);
  $LDAP['ignore_cert_errors'] = ((strcasecmp(getenv('LDAP_IGNORE_CERT_ERRORS'),'TRUE') == 0) ? TRUE : FALSE);