diff --git a/src/bees-roots.cc b/src/bees-roots.cc
index dd675cb..0d03594 100644
--- a/src/bees-roots.cc
+++ b/src/bees-roots.cc
@@ -1938,7 +1938,6 @@ BeesRoots::stop_request()
 	unique_lock<mutex> lock(m_stop_mutex);
 	m_stop_requested = true;
 	m_stop_condvar.notify_all();
-	lock.unlock();
 }
 
 void