diff --git a/pkgs/os-specific/linux/rtl8821cu/default.nix b/pkgs/os-specific/linux/rtl8821cu/default.nix
index 9229a3c13069..0ea0682214bf 100644
--- a/pkgs/os-specific/linux/rtl8821cu/default.nix
+++ b/pkgs/os-specific/linux/rtl8821cu/default.nix
@@ -13,8 +13,8 @@ stdenv.mkDerivation rec {
 
   hardeningDisable = [ "pic" ];
 
-  nativeBuildInputs = [ bc ];
-  buildInputs = kernel.moduleBuildDependencies;
+  nativeBuildInputs = [ bc ] ++ kernel.moduleBuildDependencies;
+  makeFlags = kernel.makeFlags;
 
   prePatch = ''
     substituteInPlace ./Makefile \