diff --git a/polkadot/runtime/src/lib.rs b/polkadot/runtime/src/lib.rs
index c277374d03..04eef28abc 100644
--- a/polkadot/runtime/src/lib.rs
+++ b/polkadot/runtime/src/lib.rs
@@ -403,7 +403,7 @@ mod tests {
 		// 0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
 
 		let v = Encode::encode(&tx);
-		assert_eq!(&v[..], &hex!["6f000000ff0101010101010101010101010101010101010101010101010101010101010101e70300000300df0f02000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"][..]);
+		assert_eq!(&v[..], &hex!["6f000000ff0101010101010101010101010101010101010101010101010101010101010101e70300000400df0f02000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"][..]);
 		println!("{}", HexDisplay::from(&v));
 		assert_eq!(UncheckedExtrinsic::decode(&mut &v[..]).unwrap(), tx);
 	}