diff --git a/app.json b/app.json
index 2ee194071794..ce6f572a4610 100644
--- a/app.json
+++ b/app.json
@@ -2,7 +2,8 @@
   "name": "docs.github.com",
   "env": {
     "NODE_ENV": "production",
-    "NPM_CONFIG_PRODUCTION": "true"
+    "NPM_CONFIG_PRODUCTION": "true",
+    "ENABLED_LANGUAGES": "en, de"
   },
   "buildpacks": [
     { "url": "https://github.com/DataDog/heroku-buildpack-datadog.git#1.21" },