diff --git a/package.json b/package.json
index bc2f2aa41946fd0f2034f5078c8a3d3ca9a9ea9a..6f735e6ac8c4d8a60c498c3fab95311829bd78ba 100644
--- a/package.json
+++ b/package.json
@@ -1,10 +1,10 @@
 {
     "name": "Opentech",
     "version": "1.0.0",
-    "description": "Build the static src.",
-    "cacheDirectories": ["client/node_modules"],
+    "description": "Build the static_src assets.",
+    "cacheDirectories": ["opentech/static_src/node_modules"],
     "scripts": {
-        "postinstall": "cd opentech/static_src && yarn install && npm run build:prod"
+        "heroku-postbuild": "cd opentech/static_src && yarn install && npm run build:prod"
     },
     "engines": {
         "node": "8.11.3",
diff --git a/requirements.txt b/requirements.txt
index 02d44e86ef1d9b5b38db12209f8f1781307131e1..49bd97ebd78e75869022cb2fd2c1985529882546 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -29,7 +29,7 @@ django_select2==6.0.1
 
 # Production dependencies
 dj-database-url==0.5.0
-django-heroku=0.3.1
+django-heroku==0.3.1
 whitenoise==2.0.4
 gunicorn==19.9.0
 ConcurrentLogHandler==0.9.1