diff --git a/libraries/schema/Pdf_Relation_Schema.class.php b/libraries/schema/Pdf_Relation_Schema.class.php
index c8d758757..972ef8ba6 100644
--- a/libraries/schema/Pdf_Relation_Schema.class.php
+++ b/libraries/schema/Pdf_Relation_Schema.class.php
@@ -40,6 +40,7 @@ class PMA_PDF extends TCPDF
     var $def_outlines;
     var $Alias = array();
     var $widths;
+    private $_ff = PMA_PDF_FONT;
 
     public function getH()
     {