diff --git a/modules/hm/dev.nix b/modules/hm/dev.nix
index 22a24ab..afa3899 100644
--- a/modules/hm/dev.nix
+++ b/modules/hm/dev.nix
@@ -63,6 +63,7 @@ let
       taplo = cmd: {
         command = [
           cmd
+          "format"
           "--stdin-filepath=$path"
           "-"
         ];