diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 7a020c8..6ab31d0 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -20,7 +20,7 @@ jobs:
           extra-conf: |
             # Swoop de doop
             # Beep boop
-            experimental-features = repl-flake
+            extra-experimental-features = repl-flake
       - run: cat /etc/nix/nix.conf
       - uses: DeterminateSystems/magic-nix-cache-action@main
       - run: nix flake check