diff --git a/nixos/modules/installer/cd-dvd/iso-image.nix b/nixos/modules/installer/cd-dvd/iso-image.nix
index b85f20bb09bc3..5243a8aa747bf 100644
--- a/nixos/modules/installer/cd-dvd/iso-image.nix
+++ b/nixos/modules/installer/cd-dvd/iso-image.nix
@@ -427,7 +427,7 @@ in
 
     isoImage.volumeID = mkOption {
       # nixos-$EDITION-$RELEASE-$ARCH
-      default = "nixos${optionalString (config.isoImage.edition != "") "-${config.isoImage.edition}"}-${config.system.nixos.release}-${pkgs.stdenv.hostPlatform.system}";
+      default = "nixos${optionalString (config.isoImage.edition != "") "-${config.isoImage.edition}"}-${config.system.nixos.release}-${pkgs.stdenv.hostPlatform.uname.processor}";
       description = ''
         Specifies the label or volume ID of the generated ISO image.
         Note that the label is used by stage 1 of the boot process to