diff --git a/flake.nix b/flake.nix
index ffb1c47..6979f7a 100644
--- a/flake.nix
+++ b/flake.nix
@@ -183,7 +183,7 @@
                   WorkingDirectory = working_directory;
                   PrivateTmp = true;
                   ExecStart = pkgs.writeShellScript "start-zoeycomputer" ''
-                    export SECRET_KEY_BASE=$(cat ${cfg.secret_key_file})
+                    export SECRET_KEY_BASE=$(cat ${cfg.phx.secret_key_file})
                     # If a password file is specified, construct DATABASE_URL with password
                     ${
                       if cfg.phx.database.passwordFile != null