diff --git a/docker/.env.example b/docker/.env.example
index 056e65755..916b4627d 100644
--- a/docker/.env.example
+++ b/docker/.env.example
@@ -238,7 +238,7 @@ DB_TYPE=postgresql
 # For MySQL, only `root` user is supported for now
 DB_USERNAME=postgres
 DB_PASSWORD=difyai123456
-DB_HOST=db
+DB_HOST=db_postgres
 DB_PORT=5432
 DB_DATABASE=dify