diff --git a/services/track-changes/package.json b/services/track-changes/package.json
index a1ccc67276..31265d6972 100644
--- a/services/track-changes/package.json
+++ b/services/track-changes/package.json
@@ -47,6 +47,7 @@
     "chai": "~4.1.1",
     "memorystream": "0.3.1",
     "mocha": "^4.0.1",
+    "coffee-script": "^1.7.1",
     "sandboxed-module": "~0.3.0",
     "sinon": "~3.2.1",
     "timekeeper": "0.0.4"