diff --git a/require-ess/tools/build_number.sh b/require-ess/tools/build_number.sh
index 077cd15183ff41f96c1bcc6f71cac5bfb5a96cd5..f508f51e3be2e0ecb3bd0760b40b2cd3c6954801 100755
--- a/require-ess/tools/build_number.sh
+++ b/require-ess/tools/build_number.sh
@@ -1,4 +1,4 @@
-#!/bin/env bash
+#!/usr/bin/env bash
 # Small script to fetch current build nuber for a given module. If you pass a numeric version
 # but no build number, it fetches the latest build number installed from the target e3 env.
 #