diff --git a/fs/accounting/stats_groups.go b/fs/accounting/stats_groups.go
index 6bcd1ea20..776af484c 100644
--- a/fs/accounting/stats_groups.go
+++ b/fs/accounting/stats_groups.go
@@ -366,6 +366,8 @@ func (sg *statsGroups) sum() *StatsInfo {
 				sum.lastError = stats.lastError
 			}
 			sum.startedTransfers = append(sum.startedTransfers, stats.startedTransfers...)
+			sum.oldDuration += stats.oldDuration
+			sum.oldTimeRanges = append(sum.oldTimeRanges, stats.oldTimeRanges...)
 		}
 		stats.mu.RUnlock()
 	}
diff --git a/fs/accounting/stats_groups_test.go b/fs/accounting/stats_groups_test.go
index 76d93bf64..224dff9ef 100644
--- a/fs/accounting/stats_groups_test.go
+++ b/fs/accounting/stats_groups_test.go
@@ -4,8 +4,10 @@ import (
 	"fmt"
 	"runtime"
 	"testing"
+	"time"
 
 	"github.com/rclone/rclone/fstest/testy"
+	"github.com/stretchr/testify/assert"
 )
 
 func TestStatsGroupOperations(t *testing.T) {
@@ -43,17 +45,26 @@ func TestStatsGroupOperations(t *testing.T) {
 		t.Parallel()
 		stats1 := NewStats()
 		stats1.bytes = 5
-		stats1.errors = 5
+		stats1.errors = 6
+		stats1.oldDuration = time.Second
+		stats1.oldTimeRanges = []timeRange{{time.Now(), time.Now().Add(time.Second)}}
 		stats2 := NewStats()
+		stats2.bytes = 10
+		stats2.errors = 12
+		stats2.oldDuration = 2 * time.Second
+		stats2.oldTimeRanges = []timeRange{{time.Now(), time.Now().Add(2 * time.Second)}}
 		sg := newStatsGroups()
 		sg.set("test1", stats1)
 		sg.set("test2", stats2)
 		sum := sg.sum()
-		if sum.bytes != stats1.bytes+stats2.bytes {
-			t.Fatalf("sum() => bytes %d, expected %d", sum.bytes, stats1.bytes+stats2.bytes)
-		}
-		if sum.errors != stats1.errors+stats2.errors {
-			t.Fatalf("sum() => errors %d, expected %d", sum.errors, stats1.errors+stats2.errors)
+		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)
+		// dict can iterate in either order
+		a := timeRanges{stats1.oldTimeRanges[0], stats2.oldTimeRanges[0]}
+		b := timeRanges{stats2.oldTimeRanges[0], stats1.oldTimeRanges[0]}
+		if !assert.ObjectsAreEqual(a, sum.oldTimeRanges) {
+			assert.Equal(t, b, sum.oldTimeRanges)
 		}
 	})