diff --git a/Cargo.toml b/Cargo.toml
index 291c54f..859016f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -26,6 +26,9 @@ default = ["substr"]
 substr = []
 substr-usize-indices = ["substr"]
 
+[lints.rust]
+unexpected_cfgs = { level = "warn", check-cfg = ['cfg(loom, msrv)'] }
+
 [dependencies]
 serde = { version = "1", default-features = false, optional = true }
 
diff --git a/src/lib.rs b/src/lib.rs
index 0bbd28e..4f0cae3 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -64,8 +64,6 @@
 #![cfg_attr(not(feature = "std"), no_std)]
 #![deny(missing_docs)]
 #![allow(unknown_lints)]
-// for `cfg(loom)` and such -- I don't want to add a build.rs for this.
-#![allow(unexpected_cfgs)]
 
 #[doc(hidden)]
 pub extern crate alloc;