diff -r cebd0673feeb -r fb66b2959eaf src/hotspot/share/jfr/recorder/checkpoint/jfrCheckpointManager.cpp
--- a/src/hotspot/share/jfr/recorder/checkpoint/jfrCheckpointManager.cpp	Tue May 15 14:15:47 2018 -0700
+++ b/src/hotspot/share/jfr/recorder/checkpoint/jfrCheckpointManager.cpp	Tue May 15 23:37:37 2018 +0200
@@ -39,6 +39,7 @@
 #include "memory/resourceArea.hpp"
 #include "runtime/mutexLocker.hpp"
 #include "runtime/orderAccess.inline.hpp"
+#include "runtime/os.inline.hpp"
 #include "runtime/safepoint.hpp"
 
 typedef JfrCheckpointManager::Buffer* BufferPtr;