diff --git a/lib/appearance.bash b/lib/appearance.bash
index 28a131a..8e4b5ef 100644
--- a/lib/appearance.bash
+++ b/lib/appearance.bash
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 # colored grep
 export GREP_OPTIONS='--color=auto'
diff --git a/lib/history.bash b/lib/history.bash
index c0f60f2..92db21f 100644
--- a/lib/history.bash
+++ b/lib/history.bash
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 # append to bash_history if Terminal.app quits
 shopt -s histappend
@@ -17,4 +17,4 @@
 
 function rh {
   history | awk '{a[$2]++}END{for(i in a){print a[i] " " i}}' | sort -rn | head
-}
\ No newline at end of file
+}
diff --git a/lib/preexec.bash b/lib/preexec.bash
index e092d82..b1662a9 100644
--- a/lib/preexec.bash
+++ b/lib/preexec.bash
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 # http://www.twistedmatrix.com/users/glyph/preexec.bash.txt
 # preexec.bash -- Bash support for ZSH-like 'preexec' and 'precmd' functions.