diff --git a/primitives/chain-polkadot-bulletin/Cargo.toml b/primitives/chain-polkadot-bulletin/Cargo.toml
index 4ad1bb497c67e..1cabe968da01b 100644
--- a/primitives/chain-polkadot-bulletin/Cargo.toml
+++ b/primitives/chain-polkadot-bulletin/Cargo.toml
@@ -26,7 +26,7 @@ sp-runtime = { git = "https://github.com/paritytech/polkadot-sdk", branch = "mas
 sp-std = { git = "https://github.com/paritytech/polkadot-sdk", branch = "master", default-features = false }
 
 [features]
-default = ["std"]
+default = [ "std" ]
 std = [
 	"bp-header-chain/std",
 	"bp-messages/std",