diff --git a/nixos-modules/make-system-tarball.sh b/nixos-modules/make-system-tarball.sh
index 50372d5..3ce93f7 100644
--- a/nixos-modules/make-system-tarball.sh
+++ b/nixos-modules/make-system-tarball.sh
@@ -26,7 +26,7 @@ stripSlash() {
 for ((i = 0; i < ${#targets_[@]}; i++)); do
     stripSlash "${targets_[$i]}"
     mkdir -p "$(dirname "$res")"
-    cp -a "${sources_[$i]}" "$res"
+    cp -an "${sources_[$i]}" "$res"
 done