diff --git a/fonts.js b/fonts.js
index e4dfd3541..191652c1d 100644
--- a/fonts.js
+++ b/fonts.js
@@ -236,6 +236,9 @@ var Font = (function () {
     // offset
     var offset = offsets.virtualOffset;
 
+    // length
+    var length = data.length;
+
     // Per spec tables must be 4-bytes align so add padding as needed
     while (data.length & 3)
       data.push(0x00);
@@ -243,9 +246,6 @@ var Font = (function () {
     while (offsets.virtualOffset & 3)
       offsets.virtualOffset++;
 
-    // length
-    var length = data.length;
-
     // checksum
     var checksum = 0;
     for (var i = 0; i < length; i+=4)