diff --git a/nixos/modules/pspkgs.nix b/nixos/modules/pspkgs.nix
index 031852c07d19e8c86c9da297656cf15224c0c052..697bc5a0b4edf4734ac131d40a3584f4e7d5406a 100644
--- a/nixos/modules/pspkgs.nix
+++ b/nixos/modules/pspkgs.nix
@@ -1,9 +1,4 @@
-# Derive a brand new version of pkgs which has our overlays applied.  This
-# includes our definition of the `privatestorage` derivation, a Python
-# environment with Tahoe-LAFS and ZKAPAuthorizer installed.
+# Derive a brand new version of pkgs which has our overlays applied.  This is
+# where the `privatestorage` derivation is added to nixpkgs.
 { pkgs }:
-import pkgs.path {
-  overlays = [
-    (import ./overlays.nix)
-  ];
-}
+pkgs.extend (import ./overlays.nix)