diff --git a/src/read/stream.rs b/src/read/stream.rs
index 7bc91c9c..7fb76e70 100644
--- a/src/read/stream.rs
+++ b/src/read/stream.rs
@@ -220,6 +220,7 @@ mod test {
         }
     }
 
+    #[allow(dead_code)]
     #[derive(Default, Debug, Eq, PartialEq)]
     struct CounterVisitor(u64, u64);
     impl ZipStreamVisitor for CounterVisitor {