--- old/src/hotspot/share/gc/g1/g1GCPhaseTimes.hpp	2018-04-16 13:05:17.578472865 +0200
+++ new/src/hotspot/share/gc/g1/g1GCPhaseTimes.hpp	2018-04-16 13:05:17.314464769 +0200
@@ -379,7 +379,7 @@
 
 class G1GCParPhaseTimesTracker : public CHeapObj<mtGC> {
 protected:
-  double _start_time;
+  Ticks _start_time;
   G1GCPhaseTimes::GCParPhases _phase;
   G1GCPhaseTimes* _phase_times;
   uint _worker_id;