diff --git a/pkgs/top-level/splice.nix b/pkgs/top-level/splice.nix
index a093442d369..08d57339500 100644
--- a/pkgs/top-level/splice.nix
+++ b/pkgs/top-level/splice.nix
@@ -125,7 +125,7 @@ in
   # We use `callPackage' to be able to omit function arguments that can be
   # obtained `pkgs` or `buildPackages` and their `xorg` package sets. Use
   # `newScope' for sets of packages in `pkgs' (see e.g. `gnome' below).
-  callPackage = pkgs.newScope {};
+  callPackage = splicedPackages.newScope {};
 
   callPackages = lib.callPackagesWith splicedPackagesWithXorg;