diff --git a/changelog.d/18051.docker b/changelog.d/18051.docker
new file mode 100644
index 00000000000..09734645472
--- /dev/null
+++ b/changelog.d/18051.docker
@@ -0,0 +1 @@
+Fix incorrect port mapping in `docker-compose.yml`. Contributed by @Kuan-Lun.
diff --git a/contrib/docker/docker-compose.yml b/contrib/docker/docker-compose.yml
index 36d5fd53096..3d4334f88fa 100644
--- a/contrib/docker/docker-compose.yml
+++ b/contrib/docker/docker-compose.yml
@@ -29,7 +29,7 @@ services:
     # In order to expose Synapse, remove one of the following, you might for
     # instance expose the TLS port directly:
     ports:
-      - 8448:8448/tcp
+      - 8448:8008/tcp
     # ... or use a reverse proxy, here is an example for traefik:
     labels:
       # The following lines are valid for Traefik version 1.x: