diff --git a/nixos/modules/installer/cd-dvd/channel.nix b/nixos/modules/installer/cd-dvd/channel.nix
index 9893f5aa7dcb..2a0feaeb2845 100644
--- a/nixos/modules/installer/cd-dvd/channel.nix
+++ b/nixos/modules/installer/cd-dvd/channel.nix
@@ -31,7 +31,7 @@ let
 in
 
 {
-  nix.registry.nixpkgs.flake.outPath = pkgs.path;
+  nix.registry.nixpkgs.flake.outPath = builtins.path { name = "source"; path = pkgs.path; };
   # Provide the NixOS/Nixpkgs sources in /etc/nixos.  This is required
   # for nixos-install.
   boot.postBootCommands = mkAfter