diff --git a/src/etc/test-float-parse/runtests.py b/src/etc/test-float-parse/runtests.py
index 75c92b9b15ca2..d520c9bd5c30a 100644
--- a/src/etc/test-float-parse/runtests.py
+++ b/src/etc/test-float-parse/runtests.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python2.7
+#!/usr/bin/env python2.7
 #
 # Copyright 2015 The Rust Project Developers. See the COPYRIGHT
 # file at the top-level directory of this distribution and at
diff --git a/src/test/ui/update-all-references.sh b/src/test/ui/update-all-references.sh
index ddd69c399a5c1..bfc6f923f9d2e 100755
--- a/src/test/ui/update-all-references.sh
+++ b/src/test/ui/update-all-references.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Copyright 2015 The Rust Project Developers. See the COPYRIGHT
 # file at the top-level directory of this distribution and at
diff --git a/src/test/ui/update-references.sh b/src/test/ui/update-references.sh
index aa99d35f7aa77..b9ded7d1e951c 100755
--- a/src/test/ui/update-references.sh
+++ b/src/test/ui/update-references.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Copyright 2015 The Rust Project Developers. See the COPYRIGHT
 # file at the top-level directory of this distribution and at