diff --git a/pkgs/stdenv/generic/setup.sh b/pkgs/stdenv/generic/setup.sh
index 87465df1482..26d28609d87 100644
--- a/pkgs/stdenv/generic/setup.sh
+++ b/pkgs/stdenv/generic/setup.sh
@@ -220,7 +220,6 @@ isScript() {
     local fn="$1"
     local fd
     local magic
-    if ! [ -x /bin/sh ]; then return 0; fi
     exec {fd}< "$fn"
     read -r -n 2 -u "$fd" magic
     exec {fd}<&-