diff --git a/hgdriver/hgdev/hg_scanner.cpp b/hgdriver/hgdev/hg_scanner.cpp
index f1d065d..d6c8933 100644
--- a/hgdriver/hgdev/hg_scanner.cpp
+++ b/hgdriver/hgdev/hg_scanner.cpp
@@ -2764,6 +2764,7 @@ int hg_scanner::close(bool force)
 		run_ = false;
 		wait_usb_.notify();
 		wait_img_.notify();
+		wait_devsislock_.notify();
 		if(!scan_life_)
 		{
 			std::lock_guard<std::mutex>      lock(io_lock_);