diff --git a/docker/production/dockerfile b/docker/production/dockerfile
index e52f8d4..55597e7 100644
--- a/docker/production/dockerfile
+++ b/docker/production/dockerfile
@@ -30,6 +30,8 @@ FROM alpine:latest
 ENV PROJECT_NAME="headscale-ui"
 # URL for the github/git location
 ENV PROJECT_URL="https://github.com/gurucomputing/headscale-ui"
+# Port that caddy will run on
+ENV PORT="443"
 
 # Production Web Server port. Runs a self signed SSL certificate
 EXPOSE 443
diff --git a/docker/production/scripts/2-initialise.sh b/docker/production/scripts/2-initialise.sh
index 710e110..c01277e 100644
--- a/docker/production/scripts/2-initialise.sh
+++ b/docker/production/scripts/2-initialise.sh
@@ -12,5 +12,11 @@ then
   cp /staging/Caddyfile /data/Caddyfile
 fi
 
+# replace port in Caddyfile if set
+if [ "$PORT" != "443" ]
+then
+  sed -i "s/:443/$PORT/g" /data/Caddyfile
+fi
+
 echo "Starting Caddy"
 /usr/sbin/caddy run --adapter caddyfile --config /data/Caddyfile
\ No newline at end of file