diff --git a/pkgs/os-specific/linux/fwts/module.nix b/pkgs/os-specific/linux/fwts/module.nix
index 737d3316e21..72f25aa800e 100644
--- a/pkgs/os-specific/linux/fwts/module.nix
+++ b/pkgs/os-specific/linux/fwts/module.nix
@@ -18,7 +18,7 @@ stdenv.mkDerivation rec {
 
   hardeningDisable = [ "pic" ];
 
-  makeFlags = [
+  makeFlags = kernel.makeFlags ++ [
     "INSTALL_MOD_PATH=${placeholder "out"}"
   ];