diff --git a/Dockerfile b/Dockerfile
index 2f1b91e..5e2baae 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -75,6 +75,7 @@ RUN apt-get update && apt-get install -y \
 COPY supervisord.conf /etc/supervisord.conf
 
 COPY app.json /app/app.json
+COPY postdeploy.sh /app/postdeploy.sh
 
 ENV NEXTCLOUD_UPDATE=1
 
diff --git a/app.json b/app.json
index 23d4c7d..9c60d3c 100644
--- a/app.json
+++ b/app.json
@@ -1,7 +1,7 @@
 {
   "scripts": {
     "dokku": {
-      "postdeploy": "sh -c 'echo GYR:POSTDEPLOY:START && pwd && find . -maxdepth 1 && php -d memory_limit=-1 occ upgrade && php -d memory_limit=-1 occ db:convert-filecache-bigint && php -d memory_limit=-1 occ db:add-missing-indices && echo GYR:POSTDEPLOY:END'"
+      "postdeploy": "su -l -s /bin/sh www-data -c /app/postdeploy.sh"
     }
   }
 }
diff --git a/postdeploy.sh b/postdeploy.sh
new file mode 100755
index 0000000..57ba1e7
--- /dev/null
+++ b/postdeploy.sh
@@ -0,0 +1,13 @@
+#!/bin/sh
+
+set -u
+set -e
+
+cd /var/www/html
+echo "GYR:POSTDEPLOY:START ($(pwd))"
+find . -maxdepth 1 
+php -d memory_limit=-1 occ upgrade 
+php -d memory_limit=-1 occ db:convert-filecache-bigint 
+php -d memory_limit=-1 occ db:add-missing-indices 
+echo "GYR:POSTDEPLOY:END"
+