diff --git a/osdep/BlockingQueue.hpp b/osdep/BlockingQueue.hpp
index f3caff991..c3695e708 100644
--- a/osdep/BlockingQueue.hpp
+++ b/osdep/BlockingQueue.hpp
@@ -117,7 +117,6 @@ public:
 	}
 
 	inline size_t size() const {
-		std::unique_lock<std::mutex> lock(m);
 		return q.size();
 	}