diff --git a/Gruntfile.coffee b/Gruntfile.coffee
index 419696bd0..a25b7f6b7 100644
--- a/Gruntfile.coffee
+++ b/Gruntfile.coffee
@@ -10,7 +10,7 @@ INSTALL_DIR = path.join('/Applications', APP_NAME)
 
 module.exports = (grunt) ->
   cp = (source, destination) ->
-    if fs.statSync(source).isDirectory()
+    if grunt.file.isDir(source)
       grunt.file.recurse source, (sourcePath, rootDirectory, subDirectory='', filename) ->
         destinationPath = path.join(destination, subDirectory, filename)
         grunt.file.copy(sourcePath, destinationPath)