diff --git a/examples/kusama_balance_transfer.rs b/examples/kusama_balance_transfer.rs
index d3fc44a766..dba35b8771 100644
--- a/examples/kusama_balance_transfer.rs
+++ b/examples/kusama_balance_transfer.rs
@@ -29,7 +29,7 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
     let signer = PairSigner::new(AccountKeyring::Alice.pair());
     let dest = AccountKeyring::Bob.to_account_id().into();
 
-	let client = ClientBuilder::<KusamaRuntime>::new().build().await?;
+    let client = ClientBuilder::<KusamaRuntime>::new().build().await?;
     let hash = client.transfer(&signer, &dest, 10_000).await?;
 
     println!("Balance transfer extrinsic submitted: {}", hash);
diff --git a/src/lib.rs b/src/lib.rs
index a647f0c3b7..c35744e8a5 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -189,16 +189,16 @@ impl<T: Runtime> ClientBuilder<T> {
         .await;
         let metadata = metadata?;
         let mortal_period = if let Some(period) = self.mortal_period {
-			period
-		} else {
-        	match metadata.derive_mortal_period() {
-				Err(e) => {
-					log::error!("`Metadata::derive_mortal_period` failed. Set `mortal_period` prior to invoking `Client::build`.");
-					return Err(e.into())
-				}
-				Ok(period) => Some(period)
-        	}
-		};
+            period
+        } else {
+            match metadata.derive_mortal_period() {
+                Err(e) => {
+                    log::error!("`Metadata::derive_mortal_period` failed. Set `mortal_period` prior to invoking `Client::build`.");
+                    return Err(e.into())
+                }
+                Ok(period) => Some(period),
+            }
+        };
 
         Ok(Client {
             rpc,