diff --git a/.github/workflows/mbedtls.sh b/.github/workflows/mbedtls.sh
index 335ff352f..c2c99e90e 100644
--- a/.github/workflows/mbedtls.sh
+++ b/.github/workflows/mbedtls.sh
@@ -1,3 +1,5 @@
+#!/usr/bin/env bash
+
 set -e
 set -x