diff --git a/Dockerfile b/Dockerfile
index e6cd4fcd..8a0401b4 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -12,7 +12,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     libxslt-dev \
     zlib1g-dev \
     g++
-    
+
 RUN mkdir /install
 WORKDIR /install
 
diff --git a/changedetection.py b/changedetection.py
index c6461b62..eb79f8da 100755
--- a/changedetection.py
+++ b/changedetection.py
@@ -14,7 +14,7 @@ from backend import store
 
 def main(argv):
     ssl_mode = False
-    port = 5000
+    port = os.environ.get('PORT') or 5000
     do_cleanup = False
 
     # Must be absolute so that send_from_directory doesnt try to make it relative to backend/
diff --git a/heroku.yml b/heroku.yml
new file mode 100644
index 00000000..31dbd9ad
--- /dev/null
+++ b/heroku.yml
@@ -0,0 +1,5 @@
+build:
+  docker:
+    changedetection: Dockerfile
+run:
+  changedetection: python ./changedetection.py -d /datastore