diff --git a/include/spdlog/sinks/async_sink.h b/include/spdlog/sinks/async_sink.h
index 91c07851..4e756491 100644
--- a/include/spdlog/sinks/async_sink.h
+++ b/include/spdlog/sinks/async_sink.h
@@ -45,6 +45,8 @@ public:
     explicit async_sink(config async_config);
     async_sink(const async_sink &) = delete;
     async_sink &operator=(const async_sink &) = delete;
+    async_sink(async_sink &&) = delete;
+    async_sink &operator=(async_sink &&) = delete;
     ~async_sink() override;
 
     // sink interface implementation
@@ -103,7 +105,6 @@ private:
     std::unique_ptr<queue_t> q_;
     std::thread worker_thread_;
     details::err_helper err_helper_;
-    std::atomic_size_t flush_requests_ = 0;
     std::atomic_bool terminate_worker_ = false;
 };
 
diff --git a/src/sinks/async_sink.cpp b/src/sinks/async_sink.cpp
index ae2cba16..51832c28 100644
--- a/src/sinks/async_sink.cpp
+++ b/src/sinks/async_sink.cpp
@@ -33,6 +33,7 @@ async_sink::async_sink(config async_config)
     });
 }
 
+
 async_sink::~async_sink() {
     try {
         q_->enqueue(async_log_msg(async_log_msg::type::terminate));