diff --git a/.cargo/config.toml b/.cargo/config.toml
index fac9cc8d44..cb64404d5a 100644
--- a/.cargo/config.toml
+++ b/.cargo/config.toml
@@ -12,6 +12,7 @@ rustflags = [
 	# rustc additional warnings:
 	"-Wunused_crate_dependencies",
 	"-Wunused_lifetimes",
+	"-Wunused_macro_rules",
 	"-Wunused_tuple_struct_fields", # Will be uplifed into `dead_code` (warn-by-default) with https://github.com/rust-lang/rust/pull/118297
 	"-Wmeta_variable_misuse",
 	# Rust 2018 idioms that are not yet warn-by-default: