diff --git a/webapi/gendoc.sh b/webapi/gendoc.sh
index e9003cf..151995a 100755
--- a/webapi/gendoc.sh
+++ b/webapi/gendoc.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 set -euo pipefail
 
 # this is run with .. as working directory.