diff --git a/programs/sbf/tests/programs.rs b/programs/sbf/tests/programs.rs
index 665109c16..5dedca0f5 100644
--- a/programs/sbf/tests/programs.rs
+++ b/programs/sbf/tests/programs.rs
@@ -97,7 +97,7 @@ fn process_transaction_and_record_inner(
     Vec<Vec<InnerInstruction>>,
     Vec<String>,
 ) {
-    let signature = tx.signatures.get(0).unwrap().clone();
+    let signature = tx.signatures.first().unwrap().clone();
     let txs = vec![tx];
     let tx_batch = bank.prepare_batch_for_tests(txs);
     let mut results = bank