--- a/src/hotspot/share/gc/epsilon/epsilonHeap.hpp	Thu May 31 14:50:56 2018 +0200
+++ b/src/hotspot/share/gc/epsilon/epsilonHeap.hpp	Thu May 31 15:43:02 2018 +0200
@@ -44,11 +44,11 @@
   ContiguousSpace* _space;
   VirtualSpace _virtual_space;
   size_t _max_tlab_size;
-  size_t _last_counter_update;
-  size_t _last_heap_print;
   size_t _step_counter_update;
   size_t _step_heap_print;
   int64_t _decay_time_ns;
+  volatile size_t _last_counter_update;
+  volatile size_t _last_heap_print;
 
 public:
   static EpsilonHeap* heap();