--- old/src/hotspot/share/memory/virtualspace.cpp	2018-03-22 17:02:52.840832926 +0100
+++ new/src/hotspot/share/memory/virtualspace.cpp	2018-03-22 17:02:52.644832933 +0100
@@ -28,6 +28,7 @@
 #include "memory/virtualspace.hpp"
 #include "oops/markOop.hpp"
 #include "oops/oop.inline.hpp"
+#include "runtime/os.inline.hpp"
 #include "services/memTracker.hpp"
 #include "utilities/align.hpp"