diff --git a/PHPCI/Controller/BuildController.php b/PHPCI/Controller/BuildController.php
index 37151c4f..145236d5 100644
--- a/PHPCI/Controller/BuildController.php
+++ b/PHPCI/Controller/BuildController.php
@@ -131,7 +131,7 @@ class BuildController extends \PHPCI\Controller
         $build->setCreated(new \DateTime());
         $build->setCommitterEmail($copy->getCommitterEmail());
         $build->setCommitMessage($copy->getCommitMessage());
-        $build->setExtra($copy->getExtra());
+        $build->setExtra(json_encode($copy->getExtra()));
 
         $build = $this->buildStore->save($build);