diff -r c887851da33d -r 97d13893ec3c src/hotspot/share/gc/g1/g1CollectionSet.cpp
--- a/src/hotspot/share/gc/g1/g1CollectionSet.cpp	Wed Nov 27 10:21:22 2019 +0100
+++ b/src/hotspot/share/gc/g1/g1CollectionSet.cpp	Tue Nov 26 10:47:46 2019 +0100
@@ -33,6 +33,7 @@
 #include "gc/g1/heapRegionRemSet.hpp"
 #include "gc/g1/heapRegionSet.hpp"
 #include "logging/logStream.hpp"
+#include "runtime/orderAccess.hpp"
 #include "utilities/debug.hpp"
 #include "utilities/globalDefinitions.hpp"
 #include "utilities/quickSort.hpp"