diff --git a/contrib/clean_pyc.sh b/contrib/clean_pyc.sh
index e3d47e44..9283fb59 100755
--- a/contrib/clean_pyc.sh
+++ b/contrib/clean_pyc.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 # Display information
 echo "This script will remove *.pyc files. These files are generated by Python, but they can cause conflicts after an upgrade. It's safe to remove them, because they will be regenerated."
diff --git a/contrib/downgrade.sh b/contrib/downgrade.sh
index edd4779e..e4822c46 100755
--- a/contrib/downgrade.sh
+++ b/contrib/downgrade.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 # Parameter check
 if [ -z "$1" ]; then