diff --git a/pkgs/build-support/kernel/modules-closure.sh b/pkgs/build-support/kernel/modules-closure.sh
index c1e216956e77..7faaa0122cd2 100644
--- a/pkgs/build-support/kernel/modules-closure.sh
+++ b/pkgs/build-support/kernel/modules-closure.sh
@@ -27,7 +27,7 @@ done
 echo "closure:"
 ensureDir $out/lib/modules/"$version"
 for module in $closure; do
-    target=$(echo $module | sed "s^/nix/store/.*/lib/modules/^$out/lib/modules/^")
+    target=$(echo $module | sed "s^$NIX_STORE.*/lib/modules/^$out/lib/modules/^")
     if test -e "$target"; then continue; fi
     mkdir -p $(dirname $target)
     echo $module