diff --git a/nix/package.nix b/nix/package.nix
index b63886d..b227e1a 100644
--- a/nix/package.nix
+++ b/nix/package.nix
@@ -18,6 +18,7 @@ in
         root = s;
         fileset = fs.unions [
           (fs.fileFilter (file: builtins.any file.hasExt ["rs"]) (s + /src))
+          (s + /contrib)
           lockfile
           cargoToml
         ];
@@ -25,8 +26,8 @@ in
 
     postInstall = ''
       mkdir -p $out/share/contrib
-      cp -r ${../contrib}/corpus $out/share/contrib/
-      cp -r ${../contrib}/lua $out/share/contrib/
+      cp -rv $src/contrib/corpus $out/share/contrib
+      cp -rv $src/contrib/lua $out/share/contrib
     '';
 
     cargoLock.lockFile = lockfile;