diff --git a/solutions/13_error_handling/errors2.rs b/solutions/13_error_handling/errors2.rs
index 0597c8c..a71f9a6 100644
--- a/solutions/13_error_handling/errors2.rs
+++ b/solutions/13_error_handling/errors2.rs
@@ -17,6 +17,7 @@
 use std::num::ParseIntError;
 
 #[allow(unused_variables)]
+#[allow(clippy::question_mark)]
 fn total_cost(item_quantity: &str) -> Result<i32, ParseIntError> {
     let processing_fee = 1;
     let cost_per_item = 5;