diff --git a/pkgs/stdenv/generic/setup.sh b/pkgs/stdenv/generic/setup.sh
index 563c07407ffa..0777fa830c10 100644
--- a/pkgs/stdenv/generic/setup.sh
+++ b/pkgs/stdenv/generic/setup.sh
@@ -1,3 +1,4 @@
+# shellcheck shell=bash
 __nixpkgs_setup_set_original=$-
 set -eu
 set -o pipefail