--- a/js/src/gc/Statistics.cpp
+++ b/js/src/gc/Statistics.cpp
@@ -1093,19 +1093,21 @@ Statistics::endSlice()
     // Do this after the slice callback since it uses these values.
     if (last) {
         for (auto& count : counts)
             count = 0;
 
         // Clear the timers at the end of a GC, preserving the data for PhaseKind::MUTATOR.
         auto mutatorStartTime = phaseStartTimes[Phase::MUTATOR];
         auto mutatorTime = phaseTimes[Phase::MUTATOR];
-        PodZero(&phaseStartTimes);
+        for (mozilla::TimeStamp& t : phaseStartTimes)
+            t = TimeStamp();
 #ifdef DEBUG
-        PodZero(&phaseEndTimes);
+        for (mozilla::TimeStamp& t : phaseEndTimes)
+            t = TimeStamp();
 #endif
         PodZero(&phaseTimes);
         phaseStartTimes[Phase::MUTATOR] = mutatorStartTime;
         phaseTimes[Phase::MUTATOR] = mutatorTime;
     }
 
     aborted = false;
 }