diff --git a/src/tFPDF/TTFontFile.php b/src/tFPDF/TTFontFile.php
index 552c50b..60941fb 100644
--- a/src/tFPDF/TTFontFile.php
+++ b/src/tFPDF/TTFontFile.php
@@ -50,6 +50,10 @@ class TTFontFile
    private $maxStrLenRead;
    private $TTCFonts;
    private $version;
+   private $sFamilyClass;
+   private $sFamilySubClass;
+   private $maxUniChar;
+   private $glyphdata;
 
    public function __construct()
    {