diff --git a/examples/async.rs b/examples/async.rs
index 855b606..06f0378 100644
--- a/examples/async.rs
+++ b/examples/async.rs
@@ -1,3 +1,4 @@
+#![deny(warnings)]
 extern crate futures;
 extern crate reqwest;
 extern crate tokio_core;
diff --git a/examples/simple.rs b/examples/simple.rs
index 846bf3f..a1f7de4 100644
--- a/examples/simple.rs
+++ b/examples/simple.rs
@@ -1,3 +1,4 @@
+#![deny(warnings)]
 //! `cargo run --example simple`
 extern crate reqwest;
 extern crate env_logger;