diff --git a/htdocs/core/class/canvas.class.php b/htdocs/core/class/canvas.class.php
index a3280491adb..39eeef29d51 100644
--- a/htdocs/core/class/canvas.class.php
+++ b/htdocs/core/class/canvas.class.php
@@ -118,7 +118,7 @@ class Canvas
 	 */
 	function display_canvas()
 	{
-		global $langs;
+		global $conf, $langs;
 		
 		if (!empty($this->smarty))
 		{