diff --git a/test/lib/webdriver/webdriver.class.php b/test/lib/webdriver/webdriver.class.php
index 9bae32ded3..efbbad051f 100644
--- a/test/lib/webdriver/webdriver.class.php
+++ b/test/lib/webdriver/webdriver.class.php
@@ -1200,6 +1200,7 @@ class dom
      */
     public function setValueInZenEditor($value)
     {
-        return $this->driver->executeScript("arguments[0].setHTML('$value');", array($this->element));
+        $value = json_encode($value);
+        return $this->driver->executeScript("arguments[0].setHTML($value);", array($this->element));
     }
 }