diff --git a/flake.nix b/flake.nix
index e36297d..b80df88 100644
--- a/flake.nix
+++ b/flake.nix
@@ -355,6 +355,7 @@
                     formatter = {
                       deadnix = {
                         priority = 1;
+                        options = [ "--no-underscore" ];
                       };
 
                       nixfmt = {