diff --git a/nginx-envtpl/entrypoint.sh b/nginx-envtpl/entrypoint.sh
index c271c2e..37fb80d 100755
--- a/nginx-envtpl/entrypoint.sh
+++ b/nginx-envtpl/entrypoint.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 if [[ ! -z $NGINX_CONFIG_TEMPLATE ]]; then
   envtpl < $NGINX_CONFIG_TEMPLATE > /etc/nginx/nginx.conf