diff --git a/Cargo.toml b/Cargo.toml
index 1dbe54c8f..e797a3eac 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -25,7 +25,6 @@ ethcore-util = { path = "util" }
 ethsync = { path = "sync" }
 ethcore-devtools = { path = "devtools" }
 ethcore-rpc = { path = "rpc", optional = true }
-number_prefix = "0.2"
 rpassword = "0.1"
 
 [dev-dependencies]