diff --git a/src/listing_stream.rs b/src/listing_stream.rs
index 0e215a3..410efbd 100644
--- a/src/listing_stream.rs
+++ b/src/listing_stream.rs
@@ -45,7 +45,7 @@ impl<R: Read + Send + Seek> ListingStream<R> {
             let listing = listing?;
             list.push(listing);
         }
-        list.sort();
+        list.sort_unstable();
         Ok(list)
     }
 }