diff --git a/hgdriver/hgdev/hg_scanner_302.cpp b/hgdriver/hgdev/hg_scanner_302.cpp
index 11317eb..f7a00c5 100644
--- a/hgdriver/hgdev/hg_scanner_302.cpp
+++ b/hgdriver/hgdev/hg_scanner_302.cpp
@@ -229,8 +229,6 @@ std::string hg_scanner_302::control_fetch(int addr, int val, int size)
 	ret = write_register(addr, val);
 	if (ret == SCANNER_ERR_OK)
 	{
-		std::lock_guard<std::mutex>      lock(io_lock_);
-
 		l = size + 1;
 		data.resize(size + 2);
 		bzero(&data[0], size + 2);