diff --git a/.forgejo/workflows/build.yml b/.forgejo/workflows/build.yml
index 096dc68..56e1ac9 100644
--- a/.forgejo/workflows/build.yml
+++ b/.forgejo/workflows/build.yml
@@ -3,6 +3,9 @@ name: Build runner image
 on:
   workflow_dispatch:
 
+env:
+  NIX_CONFIG: experimental-features = nix-command flakes
+
 jobs:
   build:
     runs-on: nixos