diff -r 7a2a740815b7 -r caf115bb98ad src/hotspot/share/gc/g1/g1GCPhaseTimes.cpp
--- a/src/hotspot/share/gc/g1/g1GCPhaseTimes.cpp	Tue May 15 11:28:29 2018 -0700
+++ b/src/hotspot/share/gc/g1/g1GCPhaseTimes.cpp	Tue May 15 20:24:34 2018 +0200
@@ -488,7 +488,7 @@
 
 G1GCParPhaseTimesTracker::~G1GCParPhaseTimesTracker() {
   if (_phase_times != NULL) {
-    _phase_times->record_time_secs(_phase, _worker_id, TicksToTimeHelper::seconds(Ticks::now() - _start_time));
+    _phase_times->record_time_secs(_phase, _worker_id, (Ticks::now() - _start_time).seconds());
   }
 }
 
@@ -506,7 +506,7 @@
   if (_phase_times != NULL) {
     // Exclude trim time by increasing the start time.
     _start_time += _trim_time;
-    _phase_times->record_or_add_objcopy_time_secs(_worker_id, TicksToTimeHelper::seconds(_trim_time));
+    _phase_times->record_or_add_objcopy_time_secs(_worker_id, _trim_time.seconds());
   }
 }