diff --git a/docker-compose.yaml b/docker-compose.yaml
index 399ade4..86edac4 100644
--- a/docker-compose.yaml
+++ b/docker-compose.yaml
@@ -3,5 +3,5 @@ services:
     image: git.letsstein.de/tom/mqtt_creator:latest
     restart: unless-stopped
     ports:
-      - ${PORT}: 80
+      - "${PORT}:80"
     
\ No newline at end of file