diff --git a/heroku.yml b/heroku.yml
index 31dbd9ad..8b7afcb4 100644
--- a/heroku.yml
+++ b/heroku.yml
@@ -2,4 +2,4 @@ build:
   docker:
     changedetection: Dockerfile
 run:
-  changedetection: python ./changedetection.py -d /datastore
+  changedetection: python ./changedetection.py -d /datastore -p $PORT