diff --git a/iso/_inner-build-live.sh b/iso/_inner-build-live.sh
index 63d970b..2dc04f0 100755
--- a/iso/_inner-build-live.sh
+++ b/iso/_inner-build-live.sh
@@ -75,7 +75,8 @@ if [[ -n "${NIX_PACKAGES_PREBAKE:-}" ]]; then
 
         export NIXPKGS_ALLOW_UNFREE=1
         echo "    nix profile install: ${_NIX_PKGS[*]}"
-        nix profile install --impure "${_NIX_PKGS[@]}" 2>&1
+        nix profile add --extra-experimental-features "nix-command flakes" \
+            --impure "${_NIX_PKGS[@]}" 2>&1
 
         # Save the profile store path so we can restore from cache next time
         readlink -f /root/.nix-profile > "$_NIX_CACHE/.profile-path"