diff --git a/treefmt.toml b/treefmt.toml
index ea8b335f..1a51258f 100644
--- a/treefmt.toml
+++ b/treefmt.toml
@@ -1,7 +1,7 @@
 [global]
 excludes = [
-  "pkgs/firefox-addons/default.nix"
-  "subprojects"
+  "pkgs/firefox-addons/default.nix",
+  "subprojects",
 ]
 
 [formatter.lua]