diff --git a/Gruntfile.js b/Gruntfile.js
index 1007f4c..2236de8 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -106,6 +106,8 @@ module.exports = function(grunt) {
                     'lib/tpk/TPKLayer.js',
                     'lib/tpk/OfflineTpkNS.js',
                     'lib/tiles/TilesStore.js',
+                    'lib/tiles/lzString.js',
+                    'lib/tiles/base64String.js',
                     'lib/tpk/zip.js',
                     'lib/tpk/autoCenterMap.js',
                     'lib/tpk/inflate.js',