diff --git a/src/main.rs b/src/main.rs
index 75f53e8..d185085 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -102,7 +102,7 @@ fn main() {
         insert_airports_from_record(&mut airports, record);
     }
 
-    let code_to_id: HashMap<String, usize> = HashMap::from_iter(
+    let _code_to_id: HashMap<String, usize> = HashMap::from_iter(
         airports
             .iter()
             .map(|(id, airport)| (airport.code.clone(), *id)),