diff --git a/pkgs/by-name/jf/jfsutils/package.nix b/pkgs/by-name/jf/jfsutils/package.nix
index a0cfb595d06e..71e4c611ffc2 100644
--- a/pkgs/by-name/jf/jfsutils/package.nix
+++ b/pkgs/by-name/jf/jfsutils/package.nix
@@ -46,10 +46,8 @@ stdenv.mkDerivation rec {
 
   # this required for wipefreespace
   postInstall = ''
-    mkdir -p $out/include
-    cp include/*.h $out/include
-    mkdir -p $out/lib
-    cp ./libfs/libfs.a $out/lib
+    install -Dm644 include/*.h -t $out/include
+    install -Dm644 ./libfs/libfs.a -t $out/lib
   '';
 
   meta = {