Index: lib/Support/Windows/Path.inc
===================================================================
--- lib/Support/Windows/Path.inc
+++ lib/Support/Windows/Path.inc
@@ -416,7 +416,7 @@
       *reinterpret_cast<FILE_RENAME_INFO *>(RenameInfoBuf.data());
   RenameInfo.ReplaceIfExists = ReplaceIfExists;
   RenameInfo.RootDirectory = 0;
-  RenameInfo.FileNameLength = ToWide.size();
+  RenameInfo.FileNameLength = (ToWide.size() * sizeof(wchar_t));
   std::copy(ToWide.begin(), ToWide.end(), &RenameInfo.FileName[0]);
 
   SetLastError(ERROR_SUCCESS);