diff --git a/pkgs/os-specific/linux/cryptodev/default.nix b/pkgs/os-specific/linux/cryptodev/default.nix
index cc3a1d81109e..2fe98f8b801d 100644
--- a/pkgs/os-specific/linux/cryptodev/default.nix
+++ b/pkgs/os-specific/linux/cryptodev/default.nix
@@ -14,9 +14,11 @@ stdenv.mkDerivation rec {
   nativeBuildInputs = kernel.moduleBuildDependencies;
   hardeningDisable = [ "pic" ];
 
-  KERNEL_DIR = "${kernel.dev}/lib/modules/${kernel.modDirVersion}/build";
-  INSTALL_MOD_PATH = "\${out}";
-  prefix = "\${out}";
+  makeFlags = kernel.makeFlags ++ [
+    "KERNEL_DIR=${kernel.dev}/lib/modules/${kernel.modDirVersion}/build"
+    "INSTALL_MOD_PATH=$(out)"
+    "prefix=$(out)"
+  ];
 
   meta = {
     description = "Device that allows access to Linux kernel cryptographic drivers";