diff --git a/flake.nix b/flake.nix
index 4fe00f7..229508e 100644
--- a/flake.nix
+++ b/flake.nix
@@ -28,6 +28,10 @@
         golangci-config-file = ./.golangci.yml;
 
         cd_root = "cd $PRJ_ROOT;";
+
+        control4_env = self.lib.forAllSystems (pkgs: {
+          lua = pkgs.lua5_1;
+        });
       };
 
       formatter = self.lib.forAllSystems (pkgs: pkgs.nixpkgs-fmt);