diff --git a/polkadot/primitives/Cargo.toml b/polkadot/primitives/Cargo.toml
index 08fbfd999d..3061bb982c 100644
--- a/polkadot/primitives/Cargo.toml
+++ b/polkadot/primitives/Cargo.toml
@@ -14,7 +14,7 @@ sp-keystore = { git = "https://github.com/paritytech/substrate", branch = "maste
 sp-api = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }
 sp-version = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }
 sp-std = { package = "sp-std", git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }
-sp-io = { git = "https://github.com/paritytech/substrate", default-features = false, branch = "master" }
+sp-io = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }
 sp-staking = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }
 sp-arithmetic = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }
 sp-authority-discovery = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }