diff --git a/default.nix b/default.nix
index f1c5e37ea433eb5add61f81b6c9ed3c4b359ce25..174567c7360dcbe337b20764ce9b316543a8a23b 100644
--- a/default.nix
+++ b/default.nix
@@ -1,2 +1,2 @@
 { pkgs ? import ./nixpkgs.nix { } }:
-pkgs.python27Packages.callPackage ./zkapauthorizer.nix { }
+pkgs.python27Packages.zkapauthorizer
diff --git a/overlays.nix b/overlays.nix
index 21c2e6a7ff7357cc85d46f595b33d476344f1598..a22a766007e627e2f9a6cf96153c77d0b82c2f58 100644
--- a/overlays.nix
+++ b/overlays.nix
@@ -22,6 +22,9 @@ self: super: {
       # we depend on the privacypass python library, a set of bindings to the
       # challenge-bypass-ristretto Rust library
       privacypass = python-super.callPackage ./privacypass.nix { };
+
+      # And add ourselves to the collection too.
+      zkapauthorizer = python-super.callPackage ./zkapauthorizer.nix { };
     };
   };
 }