diff --git a/dist/tools/has_minimal_version/has_minimal_version.sh b/dist/tools/has_minimal_version/has_minimal_version.sh
index f6afdf3ae9bd..db16f9e48148 100755
--- a/dist/tools/has_minimal_version/has_minimal_version.sh
+++ b/dist/tools/has_minimal_version/has_minimal_version.sh
@@ -1,4 +1,4 @@
-#! /bin/bash
+#!/usr/bin/env bash
 #
 # usage: has_minimal_version.sh <version> <minimal_version> [toolname]
 #   Checks that version >= minimal_version
diff --git a/dist/tools/openocd/openocd.sh b/dist/tools/openocd/openocd.sh
index e6776bbee14a..d9e8b0b7ad82 100755
--- a/dist/tools/openocd/openocd.sh
+++ b/dist/tools/openocd/openocd.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Unified OpenOCD script for RIOT
 #
diff --git a/dist/tools/packer/setup.sh b/dist/tools/packer/setup.sh
old mode 100644
new mode 100755
index 018b1e8b9f76..c9cc2f005fed
--- a/dist/tools/packer/setup.sh
+++ b/dist/tools/packer/setup.sh
@@ -1,4 +1,4 @@
-#!/bin/bash -eux
+#!/usr/bin/env bash -eux
 
 # inspired by https://github.com/boxcutter/ubuntu