diff --git a/benches/x25519.rs b/benches/x25519.rs
index fee3fa9..dfcee4a 100644
--- a/benches/x25519.rs
+++ b/benches/x25519.rs
@@ -11,13 +11,7 @@
 
 //! Benchmark the Diffie-Hellman operation.
 
-#[macro_use]
-extern crate criterion;
-extern crate curve25519_dalek;
-extern crate rand_core;
-extern crate x25519_dalek;
-
-use criterion::Criterion;
+use criterion::{criterion_group, criterion_main, Criterion};
 
 use rand_core::OsRng;
 
diff --git a/src/lib.rs b/src/lib.rs
index f87b7b8..01369d0 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -155,12 +155,6 @@
 //!
 //! [crypto_box]: https://github.com/RustCrypto/AEADs/tree/master/crypto_box
 
-extern crate curve25519_dalek;
-
-extern crate rand_core;
-
-extern crate zeroize;
-
 mod x25519;
 
 pub use crate::x25519::*;
diff --git a/src/x25519.rs b/src/x25519.rs
index 6edd2c0..d63405e 100644
--- a/src/x25519.rs
+++ b/src/x25519.rs
@@ -281,8 +281,6 @@ fn clamp_scalar(mut scalar: [u8; 32]) -> Scalar {
 ///
 /// # Example
 /// ```
-/// # extern crate rand_core;
-/// #
 /// use rand_core::OsRng;
 /// use rand_core::RngCore;
 ///