diff --git a/crates/s3/src/select.rs b/crates/s3/src/select.rs
index a752244..a6f52a9 100644
--- a/crates/s3/src/select.rs
+++ b/crates/s3/src/select.rs
@@ -234,6 +234,12 @@ mod tests {
         assert!(matches!(e, Error::NotFound(msg) if msg.contains("Bucket")));
     }
 
+    #[test]
+    fn classify_missing_code_maps_no_such_key_substring() {
+        let e = classify_aws_code(None, "Service error: ... NoSuchKey ...");
+        assert!(matches!(e, Error::NotFound(msg) if msg.contains("Object")));
+    }
+
     #[test]
     fn classify_missing_code_maps_access_denied_substring() {
         let e = classify_aws_code(None, "Service error: ... AccessDenied ...");