diff --git a/docker-init.sh b/docker-init.sh
index de0fa8eb..1c96a586 100755
--- a/docker-init.sh
+++ b/docker-init.sh
@@ -3,6 +3,11 @@ echo "prepare environment"
 # replace BASE_URL constant by REMARK_URL
 sed -i "s|https://demo.remark42.com|${REMARK_URL}|g" /srv/web/*.{js,html}
 
+if [ -n "${SITE_ID}" ]; then
+  #replace "site_id: 'remark'" by SITE_ID
+  se -i "s|'remark'|'${SITE_ID}'|g" /srv/web/*.html
+fi
+
 if [ -d "/srv/var" ]; then
   chown -R app:app /srv/var 2>/dev/null
 else