diff --git a/Cargo.toml b/Cargo.toml
index 1de9877..9236719 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -37,3 +37,6 @@ pretty_assertions = "1.4"
 
 [lib]
 proc-macro = true
+
+[lints.rust]
+unexpected_cfgs = { level = "warn", check-cfg = ['cfg(instability_disable_unstable_docs)'] }
diff --git a/build.rs b/build.rs
deleted file mode 100644
index de60773..0000000
--- a/build.rs
+++ /dev/null
@@ -1,3 +0,0 @@
-fn main() {
-    println!("cargo:rustc-check-cfg=cfg(instability_disable_unstable_docs)");
-}