diff --git a/device/win_usb/win_usb.cpp b/device/win_usb/win_usb.cpp
index bb09c38..a27e1a0 100644
--- a/device/win_usb/win_usb.cpp
+++ b/device/win_usb/win_usb.cpp
@@ -1217,6 +1217,12 @@ void usb_monitor::quit(void)
     {
         PostMessage(wnd_monitor_, WM_QUIT, 0, 0);
     }
+
+    {
+        std::lock_guard<std::mutex> lock(lock_);
+        for (auto& v : devices_)
+            v->release();
+    }
 }
 
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////