diff --git a/modules/installer/tools/nixos-install.sh b/modules/installer/tools/nixos-install.sh
index 51270650429..41922652cfb 100644
--- a/modules/installer/tools/nixos-install.sh
+++ b/modules/installer/tools/nixos-install.sh
@@ -159,6 +159,7 @@ done
 
 
 # Get the absolute path to the NixOS/Nixpkgs sources.
+export NIX_PATH=${NIX_PATH+$NIX_PATH:}/nix/var/nix/profiles/per-user/root/channels/nixos
 nixpkgs_src=$(nix-instantiate --find-file nixpkgs)
 nixos_src=$(nix-instantiate --find-file nixos)