diff --git a/pkgs/build-support/fetchgit/nix-prefetch-git b/pkgs/build-support/fetchgit/nix-prefetch-git
index 22d46257075..fbefba5ccc0 100755
--- a/pkgs/build-support/fetchgit/nix-prefetch-git
+++ b/pkgs/build-support/fetchgit/nix-prefetch-git
@@ -1,4 +1,6 @@
-#! /bin/sh -e
+#! /usr/bin/env bash
+
+set -e -o pipefail
 
 url=
 rev=