diff --git a/hosts/thrall/default.nix b/hosts/thrall/default.nix
index 40d72b6..0d6b3ad 100644
--- a/hosts/thrall/default.nix
+++ b/hosts/thrall/default.nix
@@ -14,7 +14,7 @@ in {
 
   nix.package = pkgs.nixUnstable;
   nix.extraOptions = ''
-    experimental-features = nix-command flakes ca-derivations
+    experimental-features = nix-command flakes repl-flake ca-derivations
   '';
   # nix.registry.nixpkgs.flake = nixpkgs;