diff --git a/fs/accounting/stats_groups.go b/fs/accounting/stats_groups.go
index 421fabfc3..cde662645 100644
--- a/fs/accounting/stats_groups.go
+++ b/fs/accounting/stats_groups.go
@@ -375,6 +375,9 @@ func (sg *statsGroups) sum(ctx context.Context) *StatsInfo {
 			sum.startedTransfers = append(sum.startedTransfers, stats.startedTransfers...)
 			sum.oldDuration += stats.oldDuration
 			sum.oldTimeRanges = append(sum.oldTimeRanges, stats.oldTimeRanges...)
+			stats.average.mu.Lock()
+			sum.average.speed += stats.average.speed
+			stats.average.mu.Unlock()
 		}
 		stats.mu.RUnlock()
 	}
diff --git a/fs/accounting/stats_groups_test.go b/fs/accounting/stats_groups_test.go
index 8d3673a56..b8898b80e 100644
--- a/fs/accounting/stats_groups_test.go
+++ b/fs/accounting/stats_groups_test.go
@@ -62,6 +62,7 @@ func TestStatsGroupOperations(t *testing.T) {
 		assert.Equal(t, stats1.bytes+stats2.bytes, sum.bytes)
 		assert.Equal(t, stats1.errors+stats2.errors, sum.errors)
 		assert.Equal(t, stats1.oldDuration+stats2.oldDuration, sum.oldDuration)
+		assert.Equal(t, stats1.average.speed+stats2.average.speed, sum.average.speed)
 		// dict can iterate in either order
 		a := timeRanges{stats1.oldTimeRanges[0], stats2.oldTimeRanges[0]}
 		b := timeRanges{stats2.oldTimeRanges[0], stats1.oldTimeRanges[0]}