diff --git a/Dockerfile b/Dockerfile
index 4e35d32..107ffc8 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -2,7 +2,9 @@ FROM docker.io/nixos/nix:2.32.8
 
 LABEL org.opencontainers.image.source="https://git.methanium.net/alois/nixos-docker-container"
 
-ENV NIX_CONFIG="experimental-features = nix-command flakes"
+ENV NIX_CONFIG="extra-experimental-features = nix-command flakes"
+
+RUN printf '\nextra-experimental-features = nix-command flakes\n' >> /etc/nix/nix.conf
 
 RUN nix profile add \
     nixpkgs#bun \