diff --git a/webtrees/config.json b/webtrees/config.json
index 7dbc6c35e..3d68e7751 100644
--- a/webtrees/config.json
+++ b/webtrees/config.json
@@ -3,7 +3,8 @@
   "boot": "auto",
   "description": "web's leading on-line collaborative genealogy application",
   "environment": {
-    "PORT": "80"
+    "PORT": "80",
+    "WEBTREES_HOME": "/data"
   },
   "map": [
     "share:rw",
@@ -17,7 +18,7 @@
   },
   "ports": {
     "80/tcp": "9999",
-    "443/tcp": "null"
+    "443/tcp": null
   },
   "ports_description": {
     "80/tcp": "Web interface",