diff --git a/hgdriver/hgdev/hg_scanner.cpp b/hgdriver/hgdev/hg_scanner.cpp
index aecb973..56fe1c6 100644
--- a/hgdriver/hgdev/hg_scanner.cpp
+++ b/hgdriver/hgdev/hg_scanner.cpp
@@ -239,8 +239,8 @@ hg_scanner::~hg_scanner()
 	close(true);
 
 	hg_version_free_handle();
-	//if (thread_read_int_.get() && thread_read_int_->joinable())
-	//	thread_read_int_->join();
+	if (thread_read_int_.get() && thread_read_int_->joinable())
+		thread_read_int_->join();
 	if (thread_usb_read_.get() && thread_usb_read_->joinable())
 		thread_usb_read_->join();
 	if (thread_img_handle_.get() && thread_img_handle_->joinable())