diff --git a/src/AuthCode.php b/src/AuthCode.php
index 51704a564..d9786989c 100644
--- a/src/AuthCode.php
+++ b/src/AuthCode.php
@@ -13,6 +13,13 @@ class AuthCode extends Model
      */
     protected $table = 'oauth_auth_codes';
 
+    /**
+     * Indicates if the IDs are auto-incrementing.
+     *
+     * @var bool
+     */
+    public $incrementing = false;
+
     /**
      * The guarded attributes on the model.
      *