diff --git a/profiles/core/default.nix b/profiles/core/default.nix
index f0f8b407..c4247377 100644
--- a/profiles/core/default.nix
+++ b/profiles/core/default.nix
@@ -109,7 +109,8 @@ in
         keep-outputs = true
         keep-derivations = true
         fallback = true
-        experimental-features = nix-command flakes
+        # used by nix-dram
+        default-flake = flake:nixpkgs
       '';
     };