diff --git a/dokku b/dokku
index 3e1c45d14..ff9f45cba 100755
--- a/dokku
+++ b/dokku
@@ -84,6 +84,7 @@ case "$1" in
 
         # start the app
         DOCKER_ARGS=$(: | pluginhook docker-args $APP deploy)
+        DOCKER_ARGS+=" -e DYNO=$PROC_TYPE "
         DOCKER_ARGS+=$(: | pluginhook docker-args-deploy $APP)
         BIND_EXTERNAL=$(pluginhook bind-external-ip $APP)