diff --git a/src/threadpool.h b/src/threadpool.h
index 57c21b2e16..3257be2274 100644
--- a/src/threadpool.h
+++ b/src/threadpool.h
@@ -64,7 +64,7 @@ class CThreadPool
     // synchronization
     std::mutex              queue_mutex;
     std::condition_variable condition;
-    bool                    stop;
+    bool                    stop = false;
 };
 
 // the constructor just launches some amount of workers