diff --git a/irc-proto/Cargo.toml b/irc-proto/Cargo.toml
index 10b3fb6..09f269d 100644
--- a/irc-proto/Cargo.toml
+++ b/irc-proto/Cargo.toml
@@ -12,8 +12,12 @@ repository = "https://github.com/aatxe/irc"
 [badges]
 travis-ci = { repository = "aatxe/irc" }
 
+[features]
+default = ["tokio"]
+tokio = ["tokio-io", "bytes"]
+
 [dependencies]
-bytes = "0.4"
+bytes = { version = "0.4", optional = true }
 encoding = "0.2"
 failure = "0.1"
-tokio-io = "0.1"
+tokio-io = { version = "0.1", optional = true }
diff --git a/irc-proto/src/lib.rs b/irc-proto/src/lib.rs
index 0de1bc2..a39b13c 100644
--- a/irc-proto/src/lib.rs
+++ b/irc-proto/src/lib.rs
@@ -2,17 +2,21 @@
 
 #![warn(missing_docs)]
 
+#[cfg(feature = "tokio")]
 extern crate bytes;
 extern crate encoding;
 #[macro_use]
 extern crate failure;
+#[cfg(feature = "tokio")]
 extern crate tokio_io;
 
 pub mod caps;
 pub mod chan;
 pub mod command;
 pub mod error;
+#[cfg(feature = "tokio")]
 pub mod irc;
+#[cfg(feature = "tokio")]
 pub mod line;
 pub mod message;
 pub mod mode;
@@ -21,6 +25,7 @@ pub mod response;
 pub use self::caps::{Capability, NegotiationVersion};
 pub use self::chan::ChannelExt;
 pub use self::command::{BatchSubCommand, CapSubCommand, Command};
+#[cfg(feature = "tokio")]
 pub use self::irc::IrcCodec;
 pub use self::message::Message;
 pub use self::mode::{ChannelMode, Mode, UserMode};