diff --git a/fonts.js b/fonts.js
index f922c79ed..a3645cd43 100644
--- a/fonts.js
+++ b/fonts.js
@@ -733,7 +733,7 @@ var Font = (function () {
       hmtx = "\x01\xF4\x00\x00"; // Fake .notdef
       var width = 0, lsb = 0;
       for (var i = 0; i < charstrings.length; i++) {
-        width = charstrings[i].charstring[1];
+        width = charstrings[i].charstring[0];
         hmtx += string16(width) + string16(lsb);
       }
       hmtx = stringToArray(hmtx);