diff --git a/lib/motion/project/builder.rb b/lib/motion/project/builder.rb
index 2cdf2175..5c708217 100644
--- a/lib/motion/project/builder.rb
+++ b/lib/motion/project/builder.rb
@@ -456,6 +456,7 @@ EOS
       # Delete old resource files.
       Dir.chdir(bundle_path) do
         Dir.glob('**/*').each do |bundle_res|
+          bundle_res = convert_filesystem_encoding(bundle_res)
           next if File.directory?(bundle_res)
           next if reserved_app_bundle_files.include?(bundle_res)
           next if resources_files.include?(bundle_res)
@@ -478,6 +479,16 @@ EOS
       end
     end
 
+    def convert_filesystem_encoding(string)
+      begin
+        string.encode("UTF-8", "UTF8-MAC")
+      rescue
+        # for Ruby 1.8
+        require 'iconv'
+        Iconv.conv("UTF-8", "UTF8-MAC", string)
+      end
+    end
+
     def codesign(config, platform)
       bundle_path = config.app_bundle(platform)
       raise unless File.exist?(bundle_path)