diff --git a/hive.nix b/hive.nix
index 71180d5..139b978 100644
--- a/hive.nix
+++ b/hive.nix
@@ -46,24 +46,27 @@ let
       inherit version;
     };
 
+  mkNixpkgsConfigPerSystem =
+    system: _:
+    if system == "nixos" then
+      { }
+    else
+      (import "${sources.liminix}/devices/${system}").system
+      // {
+        overlays = [ (import "${sources.liminix}/overlay.nix") ];
+        config = {
+          allowUnsupportedSystem = true; # mipsel
+          permittedInsecurePackages = [
+            "python-2.7.18.8" # Python < 3 is needed for kernel backports.
+          ];
+        };
+      };
+
   # Instanciate a specialized version of nixpkgs
   mkSystemNixpkgs =
     system: version:
     let
-      args =
-        if system == "nixos" then
-          { }
-        else
-          (import "${sources.liminix}/devices/${system}").system
-          // {
-            overlays = [ (import "${sources.liminix}/overlay.nix") ];
-            config = {
-              allowUnsupportedSystem = true; # mipsel
-              permittedInsecurePackages = [
-                "python-2.7.18.8" # Python < 3 is needed for kernel backports.
-              ];
-            };
-          };
+      args = mkNixpkgsConfigPerSystem system version;
     in
     import (mkNixpkgs' version) args;
 
@@ -93,19 +96,31 @@ in
 {
   registry = {
     zyxel-nwa50ax = {
-      evalConfig = import "${sources.liminix}/lib/eval-config.nix" { nixpkgs = sources.nixos-unstable; };
+      evalConfig = import "${sources.liminix}/lib/eval-config.nix" {
+        nixpkgs = sources.nixos-unstable;
+      };
 
       defaults = _: {
-        nixpkgs.hostPlatform = {
-          config = "mipsel-unknown-linux-musl";
-          gcc = {
-            abi = "32";
-            arch = "mips32"; # mips32r2?
+        nixpkgs = {
+          source = sources.nixos-unstable;
+          config = {
+            allowUnsupportedSystem = true; # mipsel
+            permittedInsecurePackages = [
+              "python-2.7.18.8" # Python < 3 is needed for kernel backports.
+            ];
           };
+          hostPlatform = {
+            config = "mipsel-unknown-linux-musl";
+            gcc = {
+              abi = "32";
+              arch = "mips32"; # mips32r2?
+            };
+          };
+
+          # It's impure, but who cares?
+          # Can Flakes do that?
+          buildPlatform = builtins.currentSystem;
         };
-        # It's impure, but who cares?
-        # Can Flakes do that?
-        nixpkgs.buildPlatform = builtins.currentSystem;
       };
     };