diff --git a/pkgs/os-specific/linux/kernel-headers/default.nix b/pkgs/os-specific/linux/kernel-headers/default.nix
index 8107f7d965759..5e7634dc28335 100644
--- a/pkgs/os-specific/linux/kernel-headers/default.nix
+++ b/pkgs/os-specific/linux/kernel-headers/default.nix
@@ -41,8 +41,8 @@ let
 
     # !!! hacky
     fixupPhase = ''
-      ln -s asm $out/include/asm-$platform
-      if test "$platform" = "i386" -o "$platform" = "x86_64"; then
+      ln -s asm $out/include/asm-$ARCH
+      if test "$ARCH" = "i386" -o "$ARCH" = "x86_64"; then
         ln -s asm $out/include/asm-x86
       fi
     '';