diff --git a/pkg/cortex/serve/poll/readiness.sh b/pkg/cortex/serve/poll/readiness.sh
index ee5fc347e9..b3a52e4327 100644
--- a/pkg/cortex/serve/poll/readiness.sh
+++ b/pkg/cortex/serve/poll/readiness.sh
@@ -1,4 +1,4 @@
-#!/usr/bin/with-contenv bash
+#!/usr/bin/with-contenv sh
 
 # Copyright 2020 Cortex Labs, Inc.
 #