diff --git a/quiche/quic/core/web_transport_interface.h b/quiche/quic/core/web_transport_interface.h
index f87768c..dc145f7 100644
--- a/quiche/quic/core/web_transport_interface.h
+++ b/quiche/quic/core/web_transport_interface.h
@@ -41,6 +41,10 @@
       return webtransport::DatagramStatus(
           webtransport::DatagramStatusCode::kInternalError,
           absl::StrCat("Internal error: ", MessageStatusToString(status)));
+    default:
+      return webtransport::DatagramStatus(
+          webtransport::DatagramStatusCode::kInternalError,
+          absl::StrCat("Unknown status: ", MessageStatusToString(status)));
   }
 }