--- old/src/share/vm/memory/filemap.cpp	2017-07-03 08:28:27.000000000 -0700
+++ new/src/share/vm/memory/filemap.cpp	2017-07-03 08:28:27.000000000 -0700
@@ -150,7 +150,7 @@
 FileMapInfo::FileMapInfo() {
   assert(_current_info == NULL, "must be singleton"); // not thread safe
   _current_info = this;
-  memset(this, 0, sizeof(FileMapInfo));
+  memset((void*)this, 0, sizeof(FileMapInfo));
   _file_offset = 0;
   _file_open = false;
   _header = SharedClassUtil::allocate_file_map_header();