diff --git a/default.nix b/default.nix
index 95921f55..b794601c 100644
--- a/default.nix
+++ b/default.nix
@@ -1,14 +1,14 @@
 {sources ? import ./nix/sources.nix}: {
-  nixosConfigurations = {
-    vanadium = import (sources.nixpkgs + "/nixos/lib/eval-config.nix") {
+  nixosConfigurations = builtins.mapAttrs (_: import (sources.nixpkgs + "/nixos/lib/eval-config.nix")) {
+    vanadium = {
       system = "x86_64-linux";
       modules = [./nix/configurations/vanadium.nix];
     };
-    tungsten = import (sources.nixpkgs + "/nixos/lib/eval-config.nix") {
+    tungsten = {
       system = "x86_64-linux";
       modules = [./nix/configurations/tungsten.nix];
     };
-    installer = import (sources.nixpkgs + "/nixos/lib/eval-config.nix") {
+    installer = {
       system = "x86_64-linux";
       modules = [./nix/configurations/installer.nix];
     };