diff --git a/hgsane/sane_hg_mdw.cpp b/hgsane/sane_hg_mdw.cpp
index 272fde2..7a8029e 100644
--- a/hgsane/sane_hg_mdw.cpp
+++ b/hgsane/sane_hg_mdw.cpp
@@ -1768,6 +1768,22 @@ SANE_Option_Descriptor* hg_sane_middleware::get_option_descriptor(SANE_Handle h,
 }
 SANE_Status hg_sane_middleware::set_option(SANE_Handle h, const void* option, SANE_Action action, void* value, SANE_Int* after_do)
 {
+	if ((IS_PTR_NUMBER(option) && (int)option == SANE_OPT_ID_DRIVER_LOG) ||
+		(!IS_PTR_NUMBER(option) && strcmp((const char*)option, SANE_STD_OPT_NAME_DRIVER_LOG) == 0))
+	{
+		// omit value of 'h' ...
+		long		id = SANE_OPT_ID_DRIVER_LOG,
+					l = 0;
+		std::string	name(local_utility::un_json_option_name(id, (int*)&l));
+
+		if (action == SANE_ACTION_GET_VALUE)
+			return local_utility::scanner_err_2_sane_statu(hg_scanner_get_parameter(h, SANE_STD_OPT_NAME_DRIVER_LOG, (char*)value, &l));
+		else if (action == SANE_ACTION_SET_VALUE)
+			return local_utility::scanner_err_2_sane_statu(hg_scanner_set_parameter(h, SANE_STD_OPT_NAME_DRIVER_LOG, (char*)value, &l));
+		else
+			return SANE_STATUS_INVAL;
+	}
+
 	LPDEVINST		dev = nullptr;
 	scanner_handle	handle = find_openning_device(h, false, &dev);