diff --git a/model/Model.php b/model/Model.php
index c57ea9b..53278c5 100644
--- a/model/Model.php
+++ b/model/Model.php
@@ -107,7 +107,7 @@ abstract class Model
      */
     public function update($data, $where)
     {
-        if (is_int($where)) {
+        if (is_int($where) || $where === (string) (int) $where) {
             $where = $this->identify($this->key) . '=' . (int) $where;
         }
         return $this->db->update($this->table(), $data, $where);