diff --git a/src/FontLib/Font.php b/src/FontLib/Font.php
index ecc216e..e13a653 100644
--- a/src/FontLib/Font.php
+++ b/src/FontLib/Font.php
@@ -28,7 +28,7 @@ public static function load($file) {
           throw new FontNotFoundException($file);
       }
 
-    $header = file_get_contents($file, false, null, null, 4);
+    $header = file_get_contents($file, false, null, 0, 4);
     $class  = null;
 
     switch ($header) {