diff --git a/tools/check_for_upgrade.sh b/tools/check_for_upgrade.sh
old mode 100644
new mode 100755
index 581f03a07..3ba70583d
--- a/tools/check_for_upgrade.sh
+++ b/tools/check_for_upgrade.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/usr/bin/env zsh
 
 function _current_epoch() {
   echo $(($(date +%s) / 60 / 60 / 24))
diff --git a/tools/theme_chooser.sh b/tools/theme_chooser.sh
index 4d7047444..ea58c43ac 100755
--- a/tools/theme_chooser.sh
+++ b/tools/theme_chooser.sh
@@ -1,4 +1,4 @@
-#!/bin/zsh
+#!/usr/bin/env zsh
 
 # Zsh Theme Chooser by fox (fox91 at anche dot no)
 # This program is free software. It comes without any warranty, to