diff --git a/tools/build b/tools/build
index 1aca25b..4f66902 100755
--- a/tools/build
+++ b/tools/build
@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/bin/bash
 
 set -e
 
diff --git a/tools/build-loop b/tools/build-loop
index 02d70d5..5384701 100755
--- a/tools/build-loop
+++ b/tools/build-loop
@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/bin/bash
 
 TRAPPING=0
 trap "{ echo finishing; TRAPPING=1; }" SIGINT
diff --git a/tools/format b/tools/format
index c104525..457b13f 100755
--- a/tools/format
+++ b/tools/format
@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/bin/bash
 
 set -eo pipefail
 
diff --git a/tools/generate b/tools/generate
index be41375..af897e5 100755
--- a/tools/generate
+++ b/tools/generate
@@ -1,3 +1,3 @@
-#!/usr/bin/env bash
+#!/bin/bash
 
 exec go run tools/generate.go $@
diff --git a/tools/measure b/tools/measure
index 39d583b..f62c578 100755
--- a/tools/measure
+++ b/tools/measure
@@ -1,3 +1,3 @@
-#!/usr/bin/env bash
+#!/bin/bash
 
 exec go run tools/measure.go
diff --git a/tools/serve b/tools/serve
index 1d4b594..baf68d1 100755
--- a/tools/serve
+++ b/tools/serve
@@ -1,3 +1,3 @@
-#!/usr/bin/env bash
+#!/bin/bash
 
 exec go run tools/serve.go
diff --git a/tools/test b/tools/test
index c380515..c0c9c55 100755
--- a/tools/test
+++ b/tools/test
@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/bin/bash
 
 # Sanity testing of the examples.
 
diff --git a/tools/upload b/tools/upload
index c00a2ab..5ca34ef 100755
--- a/tools/upload
+++ b/tools/upload
@@ -1,3 +1,3 @@
-#!/usr/bin/env bash
+#!/bin/bash
 
 exec go run tools/upload.go -region us-east-1 -bucket gobyexample.com