diff --git a/conf/fallback_config.yaml b/conf/fallback_config.yaml
index 7ef7995..e629027 100644
--- a/conf/fallback_config.yaml
+++ b/conf/fallback_config.yaml
@@ -5,7 +5,7 @@ mode: rule
 log-level: info
 ipv6: true
 external-controller: 127.0.0.1:9090
-secret: "${CLASH_SECRET}" 
+secret: 'SECRET_PLACEHOLDER'
 external-ui: /opt/clash-for-linux/ui
 dns:
   enable: true