diff --git a/core/designdocument.class.inc.php b/core/designdocument.class.inc.php
index 90017b48a..e90c2967c 100644
--- a/core/designdocument.class.inc.php
+++ b/core/designdocument.class.inc.php
@@ -23,6 +23,9 @@
 
 namespace Combodo\iTop;
 
+use \DOMDocument;
+use \DOMFormatException;
+
 /**
  * Class \Combodo\iTop\DesignDocument
  *
@@ -30,7 +33,7 @@ namespace Combodo\iTop;
  * characteristics is that it can be altered by the mean of the same kind of document.
  *
  */
-class DesignDocument extends \DOMDocument
+class DesignDocument extends DOMDocument
 {
 	/**
 	 * @throws \Exception
diff --git a/setup/compiler.class.inc.php b/setup/compiler.class.inc.php
index 06c24cde9..6ba3580fd 100644
--- a/setup/compiler.class.inc.php
+++ b/setup/compiler.class.inc.php
@@ -32,7 +32,7 @@ class DOMFormatException extends Exception
      * @param type $previous
      * @param DOMNode $node [Optionnal] DOMNode causing the DOMFormatException
      */
-    public function __construct($message, $code, $previous, DOMNode $node = null)
+    public function __construct($message, $code = null, $previous = null, DOMNode $node = null)
     {
         if($node !== null)
         {