diff --git a/pkgs/os-specific/linux/exfat/default.nix b/pkgs/os-specific/linux/exfat/default.nix
index e66ac4d65ab9..59f9c709e5fa 100644
--- a/pkgs/os-specific/linux/exfat/default.nix
+++ b/pkgs/os-specific/linux/exfat/default.nix
@@ -21,6 +21,9 @@ stdenv.mkDerivation rec {
 
   makeFlags = [
     "KDIR=${kernel.dev}/lib/modules/${kernel.modDirVersion}/build"
+    "ARCH=${stdenv.hostPlatform.platform.kernelArch}"
+  ] ++ stdenv.lib.optional (stdenv.hostPlatform != stdenv.buildPlatform) [
+    "CROSS_COMPILE=${stdenv.cc.targetPrefix}"
   ];
 
   installPhase = ''