diff --git a/pkgs/development/python-modules/biliass/default.nix b/pkgs/development/python-modules/biliass/default.nix
index f58f280dae5e..03a8c74936f5 100644
--- a/pkgs/development/python-modules/biliass/default.nix
+++ b/pkgs/development/python-modules/biliass/default.nix
@@ -28,8 +28,9 @@ buildPythonPackage rec {
       pname
       version
       src
+      sourceRoot
+      cargoRoot
       ;
-    sourceRoot = "${sourceRoot}/${cargoRoot}";
     hash = "sha256-tkHl6z0En+od//fCGJXK/p8Dz5KDOXltHrXhxHmHL6U=";
   };