diff --git a/lib/FroalaEditor/S3.php b/lib/FroalaEditor/S3.php
index d79602e..16f447e 100644
--- a/lib/FroalaEditor/S3.php
+++ b/lib/FroalaEditor/S3.php
@@ -113,7 +113,7 @@ public static function getHash($config) {
     // Set params in response.
     $response->params = $params;
 
-    return $response;
+    return json_encode($response);
   }
 }