diff --git a/modules/services/home-manager-auto-expire.nix b/modules/services/home-manager-auto-expire.nix
index 9522461d9..467a5554d 100644
--- a/modules/services/home-manager-auto-expire.nix
+++ b/modules/services/home-manager-auto-expire.nix
@@ -70,40 +70,40 @@ in
     };
   };
 
-  config = lib.mkIf cfg.enable {
-    assertions = [
-      (lib.hm.assertions.assertPlatform "services.home-manager.autoExpire" pkgs lib.platforms.linux)
-    ];
+  config = lib.mkIf cfg.enable (
+    lib.mkMerge [
+      (lib.mkIf pkgs.stdenv.isLinux {
+        systemd.user = {
+          timers.home-manager-auto-expire = {
+            Unit.Description = "Home Manager expire generations timer";
 
-    systemd.user = {
-      timers.home-manager-auto-expire = {
-        Unit.Description = "Home Manager expire generations timer";
+            Install.WantedBy = [ "timers.target" ];
 
-        Install.WantedBy = [ "timers.target" ];
+            Timer = {
+              OnCalendar = cfg.frequency;
+              Unit = "home-manager-auto-expire.service";
+              Persistent = true;
+            };
+          };
 
-        Timer = {
-          OnCalendar = cfg.frequency;
-          Unit = "home-manager-auto-expire.service";
-          Persistent = true;
+          services.home-manager-auto-expire = {
+            Unit.Description = "Home Manager expire generations";
+
+            Service.ExecStart = toString (
+              pkgs.writeShellScript "home-manager-auto-expire" (
+                ''
+                  echo "Expire old Home Manager generations"
+                  ${homeManagerPackage}/bin/home-manager expire-generations '${cfg.timestamp}'
+                ''
+                + lib.optionalString cfg.store.cleanup ''
+                  echo "Clean-up Nix store"
+                  ${pkgs.nix}/bin/nix-collect-garbage ${cfg.store.options}
+                ''
+              )
+            );
+          };
         };
-      };
-
-      services.home-manager-auto-expire = {
-        Unit.Description = "Home Manager expire generations";
-
-        Service.ExecStart = toString (
-          pkgs.writeShellScript "home-manager-auto-expire" (
-            ''
-              echo "Expire old Home Manager generations"
-              ${homeManagerPackage}/bin/home-manager expire-generations '${cfg.timestamp}'
-            ''
-            + lib.optionalString cfg.store.cleanup ''
-              echo "Clean-up Nix store"
-              ${pkgs.nix}/bin/nix-collect-garbage ${cfg.store.options}
-            ''
-          )
-        );
-      };
-    };
-  };
+      })
+    ]
+  );
 }