diff --git a/addressbook/inc/class.socontacts.inc.php b/addressbook/inc/class.socontacts.inc.php
index f05b0e70c6..40786bff96 100755
--- a/addressbook/inc/class.socontacts.inc.php
+++ b/addressbook/inc/class.socontacts.inc.php
@@ -323,7 +323,7 @@ class socontacts
 		{
 			return array();	// ldap does not support custom-fields (non-nummeric uid)
 		}
-		if (is_null($fields)) $fields = array_keys($this->customfields);
+		if (is_null($field_names)) $field_names = array_keys($this->customfields);
 
 		foreach($ids as $key => $id)
 		{