diff --git a/modules/outputs/initramfs.nix b/modules/outputs/initramfs.nix
index b1e0ea8..0b1b12a 100644
--- a/modules/outputs/initramfs.nix
+++ b/modules/outputs/initramfs.nix
@@ -13,6 +13,14 @@ in
     boot.initramfs = {
       enable = mkEnableOption "initramfs";
     };
+    system.build.toplevel = mkOption {
+        type = types.package;
+        description = ''
+          pkgs.systemconfig for the configured filesystem,
+          contains 'activate' and 'init' commands
+        '';
+        internal = true;
+    };
     system.outputs = {
       initramfs = mkOption {
         type = types.package;
@@ -39,6 +47,8 @@ in
       INITRAMFS_COMPRESSION_ZSTD = "y";
     };
 
+    system.build.toplevel = config.system.outputs.systemConfiguration;
+
     system.outputs = {
       initramfs =
         let