diff --git a/Cargo.toml b/Cargo.toml
index e4e6f86..b432583 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -13,12 +13,12 @@ for nonblocking I/O streams.
 
 [dependencies]
 futures = "0.1"
-tokio-core = "0.1"
 tokio-io = "0.1"
 rustls = "0.5"
 tokio-proto = { version = "0.1", optional = true }
 
 [dev-dependencies]
+tokio-core = "0.1"
 clap = "2.20"
 webpki-roots = "0.7"
 tokio-file-unix = "0.2"
diff --git a/src/lib.rs b/src/lib.rs
index 36b4d09..1ecbfeb 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -4,7 +4,6 @@
 
 #[cfg_attr(feature = "tokio-proto", macro_use)] extern crate futures;
 extern crate tokio_io;
-extern crate tokio_core;
 extern crate rustls;
 
 pub mod proto;