--- a/src/hotspot/share/gc/shenandoah/shenandoahControlThread.cpp	Wed Nov 27 10:21:22 2019 +0100
+++ b/src/hotspot/share/gc/shenandoah/shenandoahControlThread.cpp	Tue Nov 26 10:47:46 2019 +0100
@@ -37,6 +37,7 @@
 #include "gc/shenandoah/shenandoahWorkerPolicy.hpp"
 #include "memory/iterator.hpp"
 #include "memory/universe.hpp"
+#include "runtime/atomic.hpp"
 
 ShenandoahControlThread::ShenandoahControlThread() :
   ConcurrentGCThread(),