--- a/src/hotspot/share/gc/g1/heapRegionRemSet.hpp	Wed Nov 27 10:21:22 2019 +0100
+++ b/src/hotspot/share/gc/g1/heapRegionRemSet.hpp	Tue Nov 26 10:47:46 2019 +0100
@@ -28,6 +28,7 @@
 #include "gc/g1/g1CodeCacheRemSet.hpp"
 #include "gc/g1/g1FromCardCache.hpp"
 #include "gc/g1/sparsePRT.hpp"
+#include "runtime/atomic.hpp"
 #include "utilities/bitMap.hpp"
 
 // Remembered set for a heap region.  Represent a set of "cards" that