diff --git a/lib/src/client/transport/web_streams.dart b/lib/src/client/transport/web_streams.dart
index 8480ab29..d4100add 100644
--- a/lib/src/client/transport/web_streams.dart
+++ b/lib/src/client/transport/web_streams.dart
@@ -153,6 +153,7 @@ class _GrpcWebConversionSink implements ChunkedConversionSink<ByteBuffer> {
         case _GrpcWebParseState.message:
           _parseMessage(chunkData);
           break;
+        // ignore: unreachable_switch_default
         default:
           // only expected to be hit when hot-restarting, see above
           break processingLoop;