diff --git a/nixos/tests/kernel-generic/default.nix b/nixos/tests/kernel-generic/default.nix
index a98015b58ac6..0fd9672d4006 100644
--- a/nixos/tests/kernel-generic/default.nix
+++ b/nixos/tests/kernel-generic/default.nix
@@ -55,6 +55,14 @@ let
         nodes.machine =
           { config, ... }:
           {
+            # we could/would do something like below, but linuxPackages comes from outside
+            # the machine closure, so an overlay doesn't apply to the kernelPackages.
+            # nixpkgs.overlays = [
+            #   (final: prev: {
+            #     kernelPackagesExtensions = prev.kernelPackagesExtensions ++ [ helloWorldExtension ];
+            #   })
+            # ]
+
             boot.kernelPackages = linuxPackages;
 
             boot.extraModulePackages = [ config.boot.kernelPackages.hello-world ];
@@ -93,6 +101,6 @@ mapAttrs (_: lP: testsForLinuxPackages lP) kernels
     # Useful for development testing of all Kernel configs without building full Kernel
     configfiles = mapAttrs (_: lP: lP.kernel.configfile) kernels;
 
-    testsForKernel = kernel: testsForLinuxPackages (pkgs.linuxPackagesFor kernel);
+    testsForKernel = kernel: testsForLinuxPackages (patchedPkgs.linuxPackagesFor kernel);
   };
 }