diff --git a/Cargo.toml b/Cargo.toml
index c4f2a91..9f9fbc8 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -24,7 +24,6 @@ broken_consensus_code = []
 [dependencies]
 byteorder = "0.3"
 num = "0.1"
-num_cpus = "0.2"
 rand = "0.3"
 rust-crypto = "0.2"
 rustc-serialize = "0.3"
diff --git a/src/lib.rs b/src/lib.rs
index d1b9df2..42d47a5 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -45,7 +45,6 @@ extern crate byteorder;
 extern crate crypto;
 #[macro_use] extern crate jsonrpc;
 extern crate num;
-extern crate num_cpus;
 extern crate rand;
 extern crate rustc_serialize as serialize;
 extern crate secp256k1;