XferRateLrg: newXferStats(),
					XferRateSml: newXferStats(),
				}
			}
			fstats := stat.FailStats.merge(oldst.FailStats)
			lrg := oldst.XferRateLrg.merge(*stat.XferRateLrg)
			sml := oldst.XferRateSml.merge(*stat.XferRateSml)
			stats[arn] = &BucketReplicationStat{
				Failed:          fstats.toMetric(),
				FailStats:       fstats,
				ReplicatedSize:  stat.ReplicatedSize + oldst.ReplicatedSize,

			XferRateSml:                      st.XferRateSml.Clone(),
			ReplicatedCount:                  st.ReplicatedCount,
			Failed:                           st.Failed,
			FailStats:                        st.FailStats,
		}
		if s.Failed.ErrCounts == nil {
			s.Failed.ErrCounts = make(map[string]int)
			for k, v := range st.Failed.ErrCounts {
				s.Failed.ErrCounts[k] = v
			}
		}
		c.Stats[arn] = &s