diff --git a/hacking/unify_repos.sh b/hacking/unify_repos.sh
index dbb5dce8c1..e91a1d14fe 100755
--- a/hacking/unify_repos.sh
+++ b/hacking/unify_repos.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 set -x
 set -e