diff --git a/tracks/vendor/plugins/asset_packager/lib/synthesis/asset_package.rb b/tracks/vendor/plugins/asset_packager/lib/synthesis/asset_package.rb
index 36944a8e..1f9212b4 100644
--- a/tracks/vendor/plugins/asset_packager/lib/synthesis/asset_package.rb
+++ b/tracks/vendor/plugins/asset_packager/lib/synthesis/asset_package.rb
@@ -1,3 +1,5 @@
+require 'yaml'
+
 module Synthesis
   class AssetPackage