diff --git a/Dockerfile b/Dockerfile
index 57ae312..4e35d32 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"
 
-RUN nix --extra-experimental-features "nix-command flakes" profile add \
+ENV NIX_CONFIG="experimental-features = nix-command flakes"
+
+RUN nix profile add \
     nixpkgs#bun \
     nixpkgs#gnused \
     nixpkgs#jdk21 \