diff --git a/tools/BugReportTool/BugReportTool/EventViewer.cpp b/tools/BugReportTool/BugReportTool/EventViewer.cpp
index 549ceb90b4..2575ff6aa8 100644
--- a/tools/BugReportTool/BugReportTool/EventViewer.cpp
+++ b/tools/BugReportTool/BugReportTool/EventViewer.cpp
@@ -45,7 +45,7 @@ namespace
         {
             wchar_t buff[1000];
             memset(buff, 0, sizeof(buff));
-            _snwprintf_s(buff, sizeof(buff), QUERY_BY_PROCESS.c_str(), PERIOD, processName.c_str());
+            _snwprintf_s(buff, _countof(buff), _TRUNCATE, QUERY_BY_PROCESS.c_str(), PERIOD, processName.c_str());
             return buff;
         }
 
@@ -53,7 +53,7 @@ namespace
         {
             wchar_t buff[1000];
             memset(buff, 0, sizeof(buff));
-            _snwprintf_s(buff, sizeof(buff), QUERY_BY_CHANNEL.c_str(), channelName.c_str(), PERIOD);
+            _snwprintf_s(buff, _countof(buff), _TRUNCATE, QUERY_BY_CHANNEL.c_str(), channelName.c_str(), PERIOD);
             return buff;
         }