diff --git a/dev-backend-docker-compose.yml b/dev-backend-docker-compose.yml
index ad25bf75..c2786583 100644
--- a/dev-backend-docker-compose.yml
+++ b/dev-backend-docker-compose.yml
@@ -82,19 +82,22 @@ services:
       - ecbackend
 
   nginx:
-    #  openssl req -x509 -nodes -days 3650 -newkey rsa:2048 -keyout tls_localhost_key.pem -out tls_localhost_cert.pem -subj "/C=GB/ST=London/L=London/O=Alros/OU=IT Department/CN=localhost"
+    #  see backend/dev_tls_setup for how to generate the tls certs
     hostname: synapse.m.localhost
     image: nginx:latest
     volumes:
       - ./backend/dev_nginx.conf:/etc/nginx/conf.d/default.conf:Z
-      - ./backend/tls_localhost_key.pem:/root/ssl/key.pem:Z
-      - ./backend/tls_localhost_cert.pem:/root/ssl/cert.pem:Z
+      - ./backend/dev_tls_m.localhost.key:/root/ssl/key.pem:Z
+      - ./backend/dev_tls_m.localhost.crt:/root/ssl/cert.pem:Z
     ports:
       # HOST_PORT:CONTAINER_PORT
       - "80:80"
       - "443:443"
       - "8008:80"
       - "4443:443"
+      - "8448:8448"
+    extra_hosts:
+      - "host.docker.internal:host-gateway"
     depends_on:
       - synapse
     networks: