--- a/src/hotspot/share/memory/metaspace.cpp	Tue Sep 26 14:05:27 2017 +0200
+++ b/src/hotspot/share/memory/metaspace.cpp	Thu Sep 28 09:56:54 2017 -0400
@@ -2718,7 +2718,7 @@
 
 
 size_t MetaspaceAux::_capacity_words[] = {0, 0};
-size_t MetaspaceAux::_used_words[] = {0, 0};
+volatile size_t MetaspaceAux::_used_words[] = {0, 0};
 
 size_t MetaspaceAux::free_bytes(Metaspace::MetadataType mdtype) {
   VirtualSpaceList* list = Metaspace::get_space_list(mdtype);