diff --git a/device/win_usb/win_usb.cpp b/device/win_usb/win_usb.cpp
index 7235243..7a73369 100644
--- a/device/win_usb/win_usb.cpp
+++ b/device/win_usb/win_usb.cpp
@@ -1224,6 +1224,7 @@ void usb_monitor::quit(void)
         std::lock_guard<std::mutex> lock(lock_);
         for (auto& v : devices_)
             v->release();
+        devices_.clear();
     }
 }