diff --git a/semaphore/docker-compose.yml b/semaphore/docker-compose.yml
index 3c94887..1f6fc96 100644
--- a/semaphore/docker-compose.yml
+++ b/semaphore/docker-compose.yml
@@ -24,7 +24,7 @@ services:
     environment:
       SEMAPHORE_DB_USER: semaphore_user
       SEMAPHORE_DB_PASS: StrongPassw0rd
-      SEMAPHORE_DB_HOST: mysql
+      SEMAPHORE_DB_HOST: db
       SEMAPHORE_DB_PORT: 3306
       SEMAPHORE_DB: semaphore_db  
       SEMAPHORE_PLAYBOOK_PATH: /tmp/semaphore/