diff --git a/benches/hashmap.rs b/benches/hashmap.rs
index 56ae5aa..68a1274 100644
--- a/benches/hashmap.rs
+++ b/benches/hashmap.rs
@@ -3,7 +3,6 @@
 // file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
 #![feature(test)]
-#![cfg_attr(feature = "cargo-clippy", feature(tool_lints))]
 #![cfg_attr(feature = "cargo-clippy", allow(clippy::unreadable_literal))]
 
 extern crate im;
diff --git a/benches/native.rs b/benches/native.rs
index e07f277..a53fc58 100644
--- a/benches/native.rs
+++ b/benches/native.rs
@@ -3,7 +3,6 @@
 // file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
 #![feature(test)]
-#![cfg_attr(feature = "cargo-clippy", feature(tool_lints))]
 #![cfg_attr(feature = "cargo-clippy", allow(clippy::unreadable_literal))]
 
 extern crate im;
diff --git a/benches/ordmap.rs b/benches/ordmap.rs
index b083071..5787427 100644
--- a/benches/ordmap.rs
+++ b/benches/ordmap.rs
@@ -3,7 +3,6 @@
 // file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
 #![feature(test)]
-#![cfg_attr(feature = "cargo-clippy", feature(tool_lints))]
 #![cfg_attr(feature = "cargo-clippy", allow(clippy::unreadable_literal))]
 
 extern crate im;
diff --git a/src/lib.rs b/src/lib.rs
index d972300..1d421d9 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -273,7 +273,6 @@
 //! [cons-list]: https://en.wikipedia.org/wiki/Cons#Lists
 
 #![deny(unsafe_code)]
-#![cfg_attr(feature = "cargo-clippy", feature(tool_lints))]
 #![cfg_attr(feature = "cargo-clippy", allow(clippy::type_complexity))]
 #![cfg_attr(feature = "cargo-clippy", allow(clippy::unreadable_literal))]
 #![cfg_attr(has_specialisation, feature(specialization))]