diff --git a/.gitea/workflows/build-image.yml b/.gitea/workflows/build-image.yml
index e6d378f..66fe014 100644
--- a/.gitea/workflows/build-image.yml
+++ b/.gitea/workflows/build-image.yml
@@ -7,6 +7,7 @@ jobs:
     container:
       env:
         USER: node
+        NIX_CONFIG: experimental-features = nix-command flakes
       volumes:
         - /home/paul/nix-ci/nix-runner-nix:/nix
         - /home/paul/nix-ci/nix-runner-etc-nix:/etc/nix