diff --git a/indra/viewer_components/updater/llupdateinstaller.cpp b/indra/viewer_components/updater/llupdateinstaller.cpp
index fe1e493e82..d4fbc82523 100644
--- a/indra/viewer_components/updater/llupdateinstaller.cpp
+++ b/indra/viewer_components/updater/llupdateinstaller.cpp
@@ -23,6 +23,9 @@
  * $/LicenseInfo$
  */
 
+#pragma warning(disable: 4702)      // disable 'unreachable code' so we can use lexical_cast (really!).
+
+
 #include "linden_common.h"
 #include <apr_file_io.h>
 #include <boost/lexical_cast.hpp>