diff -r c887851da33d -r 97d13893ec3c src/hotspot/share/gc/shared/parallelCleaning.cpp
--- a/src/hotspot/share/gc/shared/parallelCleaning.cpp	Wed Nov 27 10:21:22 2019 +0100
+++ b/src/hotspot/share/gc/shared/parallelCleaning.cpp	Tue Nov 26 10:47:46 2019 +0100
@@ -30,6 +30,7 @@
 #include "logging/log.hpp"
 #include "memory/resourceArea.hpp"
 #include "logging/log.hpp"
+#include "runtime/atomic.hpp"
 
 StringDedupCleaningTask::StringDedupCleaningTask(BoolObjectClosure* is_alive,
                                                  OopClosure* keep_alive,