diff --git a/libraries/schema/Pdf_Relation_Schema.class.php b/libraries/schema/Pdf_Relation_Schema.class.php
index 972ef8ba6..607853709 100644
--- a/libraries/schema/Pdf_Relation_Schema.class.php
+++ b/libraries/schema/Pdf_Relation_Schema.class.php
@@ -460,6 +460,7 @@ class Table_Stats
     public $heightCell = 6;
     public $x, $y;
     public $primary = array();
+    private $_ff = PMA_PDF_FONT;
 
     /**
      * The "Table_Stats" constructor