diff --git a/src/threaded_queue.h b/src/threaded_queue.h
index 01505724..0a52b771 100644
--- a/src/threaded_queue.h
+++ b/src/threaded_queue.h
@@ -16,6 +16,7 @@ using std::experimental::optional;
 
 struct BaseThreadQueue {
   virtual bool IsEmpty() = 0;
+  virtual ~BaseThreadQueue() = default;
 };
 
 struct MultiQueueWaiter {