diff --git a/src/Venturecraft/Revisionable/Revision.php b/src/Venturecraft/Revisionable/Revision.php
index 2fdc838..b814d57 100644
--- a/src/Venturecraft/Revisionable/Revision.php
+++ b/src/Venturecraft/Revisionable/Revision.php
@@ -21,6 +21,13 @@ class Revision extends Eloquent
      */
     public $table = 'revisions';
 
+    /**
+     * @var array
+     */
+    protected $casts = array(
+        'revisionable_id' => 'string'
+    );
+
     /**
      * @var array
      */