diff --git a/fonts.js b/fonts.js
index 40259a36e..57e2e73c8 100755
--- a/fonts.js
+++ b/fonts.js
@@ -2,7 +2,6 @@
 /* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
 
 'use strict';
-var missingGlyphs = [];
 var isWorker = (typeof window == 'undefined');
 
 /**
@@ -1645,10 +1644,8 @@ CFF.prototype = {
     for (var i = 0; i < glyphs.length; i++) {
       var glyph = glyphs[i];
       var unicode = GlyphsUnicode[glyph.glyph];
-      
       if (!unicode) {
         if (glyph.glyph != '.notdef') {
-          missingGlyphs.push(glyph.glyph);
           warn(glyph.glyph +
                ' does not have an entry in the glyphs unicode dictionary');
         }
diff --git a/pdf.js b/pdf.js
index 64eb2d452..e332e12e5 100644
--- a/pdf.js
+++ b/pdf.js
@@ -1917,7 +1917,7 @@ var Cmd = (function() {
 
 var Dict = (function() {
   function constructor() {
-    this.map = {};
+    this.map = Object.create(null);
   }
 
   constructor.prototype = {