diff --git a/rustfmt.toml b/rustfmt.toml
index 6cb3d9d9..1d2c6395 100644
--- a/rustfmt.toml
+++ b/rustfmt.toml
@@ -1,5 +1,8 @@
 # https://github.com/rust-lang/rustfmt/blob/master/Configurations.md
 
+# ignore submodules
+ignore = ["crates/activitypub-federation"]
+
 edition = "2021"
 empty_item_single_line = true
 group_imports = "StdExternalCrate"