diff --git a/benches/bench.rs b/benches/bench.rs
index 04d9bee..89a3ee6 100644
--- a/benches/bench.rs
+++ b/benches/bench.rs
@@ -2,7 +2,6 @@
 
 #![feature(test)]
 
-extern crate ryu;
 extern crate test;
 
 macro_rules! benches {
diff --git a/examples/upstream_benchmark.rs b/examples/upstream_benchmark.rs
index 7b91265..437855b 100644
--- a/examples/upstream_benchmark.rs
+++ b/examples/upstream_benchmark.rs
@@ -1,8 +1,5 @@
 // cargo run --example upstream_benchmark --release
 
-extern crate rand;
-extern crate ryu;
-
 use rand::{Rng, SeedableRng};
 
 const SAMPLES: usize = 10000;
diff --git a/src/lib.rs b/src/lib.rs
index ec49ae0..8974ed7 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -88,9 +88,6 @@
     allow(cast_lossless, many_single_char_names, unreadable_literal,)
 )]
 
-#[cfg(feature = "no-panic")]
-extern crate no_panic;
-
 mod buffer;
 mod common;
 mod d2s;
diff --git a/tests/d2s_table_test.rs b/tests/d2s_table_test.rs
index 8f27726..9e30e71 100644
--- a/tests/d2s_table_test.rs
+++ b/tests/d2s_table_test.rs
@@ -20,8 +20,6 @@
 
 #![allow(dead_code)]
 
-extern crate core;
-
 #[path = "../src/common.rs"]
 mod common;
 
diff --git a/tests/d2s_test.rs b/tests/d2s_test.rs
index a4118be..32a7821 100644
--- a/tests/d2s_test.rs
+++ b/tests/d2s_test.rs
@@ -18,9 +18,6 @@
 // is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 // KIND, either express or implied.
 
-extern crate rand;
-extern crate ryu;
-
 #[macro_use]
 mod macros;
 
diff --git a/tests/exhaustive.rs b/tests/exhaustive.rs
index 5c36969..e97045e 100644
--- a/tests/exhaustive.rs
+++ b/tests/exhaustive.rs
@@ -1,8 +1,5 @@
 #![cfg(exhaustive)]
 
-extern crate num_cpus;
-extern crate ryu;
-
 use std::str;
 use std::sync::atomic::{AtomicUsize, Ordering};
 use std::sync::Arc;
diff --git a/tests/f2s_test.rs b/tests/f2s_test.rs
index e6aaf5b..57eba43 100644
--- a/tests/f2s_test.rs
+++ b/tests/f2s_test.rs
@@ -18,9 +18,6 @@
 // is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 // KIND, either express or implied.
 
-extern crate rand;
-extern crate ryu;
-
 #[macro_use]
 mod macros;