diff --git a/systems/darwin.nix b/systems/darwin.nix
index c3a62a23..48e726e7 100644
--- a/systems/darwin.nix
+++ b/systems/darwin.nix
@@ -1,27 +1,35 @@
 args:
-with args; let
+with args;
+with allSystemAttrs; let
+  lib = nixpkgs.lib;
   macosSystem = import ../lib/macosSystem.nix;
-  x64_args = {
+  base_args = {
     inherit nix-darwin home-manager;
-    system = allSystemAttrs.x64_darwin;
-    specialArgs = allSystemSpecialArgs.x64_darwin;
-    nixpkgs = nixpkgs-darwin;
-  };
-  aarch64_args = {
-    inherit nix-darwin home-manager;
-    system = aarch64_darwin;
-    specialArgs = aarch64_darwin_specialArgs;
     nixpkgs = nixpkgs-darwin;
   };
 in {
   # macOS's configuration
   darwinConfigurations = {
-    harmonica =
-      macosSystem (x64_args
-        // darwin_harmonica_modules);
+    harmonica = macosSystem (
+      lib.attrsets.mergeAttrsList [
+        base_args
+        darwin_harmonica_modules
+        {
+          system = allSystemAttrs.x64_darwin;
+          specialArgs = allSystemSpecialArgs.x64_darwin;
+        }
+      ]
+    );
 
-    fern =
-      macosSystem (aarch64_args
-        // darwin_fern_modules);
+    fern = macosSystem (
+      lib.attrsets.mergeAttrsList [
+        base_args
+        darwin_fern_modules
+        {
+          system = aarch64_darwin;
+          specialArgs = allSystemSpecialArgs.aarch64_darwin;
+        }
+      ]
+    );
   };
 }