diff --git a/src/commands/build.js b/src/commands/build.js
index ae082b5..fb5e609 100644
--- a/src/commands/build.js
+++ b/src/commands/build.js
@@ -58,7 +58,7 @@ function createIndex(cb) {
     var dirPath = getAssetPath(dirName);
     var walker = walk(dirPath);
     walker.on('file', function(dir, stats, next) {
-      if (stats.name.charAt(0) !== '.') {
+      if (stats.name.charAt(0) !== '.' && stats.name.match(/\.js$/)) {
         var path = unroot(dir+'/'+stats.name).replace(/\.js$/, '');
         if (dirName == 'helpers') {
           helpers.push({path: path});