diff --git a/futures-channel/src/lib.rs b/futures-channel/src/lib.rs
index 91ddbaa646..2f0b7276ec 100644
--- a/futures-channel/src/lib.rs
+++ b/futures-channel/src/lib.rs
@@ -8,6 +8,7 @@
 #![cfg_attr(not(feature = "std"), no_std)]
 
 #![warn(missing_docs, missing_debug_implementations, rust_2018_idioms)]
+#![warn(clippy::all)]
 
 #![doc(html_root_url = "https://rust-lang-nursery.github.io/futures-api-docs/0.3.0-alpha.14/futures_channel")]
 
diff --git a/futures-core/src/lib.rs b/futures-core/src/lib.rs
index fbffb63653..73a4beceff 100644
--- a/futures-core/src/lib.rs
+++ b/futures-core/src/lib.rs
@@ -6,6 +6,7 @@
 #![cfg_attr(not(feature = "std"), no_std)]
 
 #![warn(missing_docs, missing_debug_implementations, rust_2018_idioms)]
+#![warn(clippy::all)]
 
 #![doc(html_root_url = "https://rust-lang-nursery.github.io/futures-api-docs/0.3.0-alpha.14/futures_core")]
 
diff --git a/futures-executor/src/lib.rs b/futures-executor/src/lib.rs
index c4064b66f1..a19f408305 100644
--- a/futures-executor/src/lib.rs
+++ b/futures-executor/src/lib.rs
@@ -5,6 +5,7 @@
 #![cfg_attr(not(feature = "std"), no_std)]
 
 #![warn(missing_docs, missing_debug_implementations, rust_2018_idioms)]
+#![warn(clippy::all)]
 
 #![doc(html_root_url = "https://rust-lang-nursery.github.io/futures-api-docs/0.3.0-alpha.14/futures_executor")]
 
diff --git a/futures-io/src/lib.rs b/futures-io/src/lib.rs
index d13aa960d8..4bcf121758 100644
--- a/futures-io/src/lib.rs
+++ b/futures-io/src/lib.rs
@@ -7,6 +7,7 @@
 #![cfg_attr(not(feature = "std"), no_std)]
 
 #![warn(missing_docs, missing_debug_implementations, rust_2018_idioms)]
+#![warn(clippy::all)]
 
 #![doc(html_root_url = "https://rust-lang-nursery.github.io/futures-api-docs/0.3.0-alpha.14/futures_io")]
 
diff --git a/futures-select-macro/src/lib.rs b/futures-select-macro/src/lib.rs
index 26df020211..cd1f3cfe57 100644
--- a/futures-select-macro/src/lib.rs
+++ b/futures-select-macro/src/lib.rs
@@ -2,6 +2,7 @@
 
 #![recursion_limit="128"]
 #![warn(rust_2018_idioms)]
+#![warn(clippy::all)]
 
 extern crate proc_macro;
 
diff --git a/futures-sink/src/lib.rs b/futures-sink/src/lib.rs
index f173fc4ec1..1db12d0cee 100644
--- a/futures-sink/src/lib.rs
+++ b/futures-sink/src/lib.rs
@@ -5,6 +5,8 @@
 
 #![cfg_attr(not(feature = "std"), no_std)]
 #![warn(missing_docs, missing_debug_implementations, rust_2018_idioms)]
+#![warn(clippy::all)]
+
 #![doc(html_root_url = "https://rust-lang-nursery.github.io/futures-api-docs/0.3.0-alpha.14/futures_sink")]
 
 #![feature(futures_api)]
diff --git a/futures-test/src/lib.rs b/futures-test/src/lib.rs
index 78850dc170..e9b15a991d 100644
--- a/futures-test/src/lib.rs
+++ b/futures-test/src/lib.rs
@@ -6,6 +6,8 @@
     futures_api,
 )]
 #![warn(missing_docs, missing_debug_implementations, rust_2018_idioms)]
+#![warn(clippy::all)]
+
 #![doc(
     html_root_url = "https://rust-lang-nursery.github.io/futures-doc/0.3.0-alpha.5/futures_test"
 )]
diff --git a/futures-util/src/lib.rs b/futures-util/src/lib.rs
index bf7acc9818..5d7fca1ffa 100644
--- a/futures-util/src/lib.rs
+++ b/futures-util/src/lib.rs
@@ -8,6 +8,7 @@
 
 #![cfg_attr(not(feature = "std"), no_std)]
 #![warn(missing_docs, missing_debug_implementations, rust_2018_idioms)]
+#![warn(clippy::all)]
 
 #![doc(html_root_url = "https://rust-lang-nursery.github.io/futures-api-docs/0.3.0-alpha.14/futures_util")]
 
diff --git a/futures-util/src/sink/fanout.rs b/futures-util/src/sink/fanout.rs
index 05b103d050..12dc0fa86e 100644
--- a/futures-util/src/sink/fanout.rs
+++ b/futures-util/src/sink/fanout.rs
@@ -103,7 +103,7 @@ mod tests {
         let (tx2, rx2) = mpsc::channel(2);
         let tx = tx1.fanout(tx2).sink_map_err(|_| ());
 
-        let src = stream::iter((0..10).map(|x| Ok(x)));
+        let src = stream::iter((0..10).map(Ok));
         let fwd = src.forward(tx);
 
         let collect_fut1 = rx1.collect::<Vec<_>>();
diff --git a/futures/src/lib.rs b/futures/src/lib.rs
index 9e3060130c..37fe3266e1 100644
--- a/futures/src/lib.rs
+++ b/futures/src/lib.rs
@@ -27,6 +27,7 @@
 #![cfg_attr(not(feature = "std"), no_std)]
 
 #![warn(missing_docs, missing_debug_implementations, rust_2018_idioms)]
+#![warn(clippy::all)]
 
 #![doc(html_root_url = "https://rust-lang-nursery.github.io/futures-api-docs/0.3.0-alpha.14/futures")]