diff --git a/webtrees/rootfs/etc/cont-init.d/99-run.sh b/webtrees/rootfs/etc/cont-init.d/99-run.sh
index f3727fdc6..297e51a40 100755
--- a/webtrees/rootfs/etc/cont-init.d/99-run.sh
+++ b/webtrees/rootfs/etc/cont-init.d/99-run.sh
@@ -87,6 +87,10 @@ else
 
 fi
 
+if bashio::config.true "base_url_portless"; then
+    export BASE_URL=$(bashio::config 'BASE_URL')
+fi
+
 ##############
 # LAUNCH APP #
 ##############