diff --git a/autoassignrole.module b/autoassignrole.module
index 29cefb2..c7f265d 100644
--- a/autoassignrole.module
+++ b/autoassignrole.module
@@ -360,7 +360,7 @@ function _autoassignrole_get_auto_roles() {
  * Implements hook_user_role_presave().
  */
 function autoassignrole_user_role_presave($role) {
-  if ($role->rid) {
+  if (!empty($role->rid)) {
     // We store the existing role name to be used later.
     $role->existing_name = db_query("SELECT name FROM {role} WHERE rid = :rid", array(':rid' => $role->rid))->fetchField();
   }