diff --git a/bin/helper_functions b/bin/helper_functions
index a13a4ec..3108861 100644
--- a/bin/helper_functions
+++ b/bin/helper_functions
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 # Simple helper functions
 
 yesno_default_no() {
diff --git a/bin/install_optrove b/bin/install_optrove
index e2c3b05..1452a78 100755
--- a/bin/install_optrove
+++ b/bin/install_optrove
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 #  install_optrove (formerly install_optsuite) -
 #  a general installer for GALAHAD/CUTEst/SIFDecode
diff --git a/bin/select_arch b/bin/select_arch
index 24ebcf8..4fe7822 100644
--- a/bin/select_arch
+++ b/bin/select_arch
@@ -1,4 +1,4 @@
-#!/bin/bash -vx
+#!/usr/bin/env bash -vx
 # Build script for SIFDecode / CUTEst / GALAHAD
 
 # syntax: select_arch