diff --git a/weed/topology/data_node.go b/weed/topology/data_node.go
index 5e48056f7..715b5ed80 100644
--- a/weed/topology/data_node.go
+++ b/weed/topology/data_node.go
@@ -135,12 +135,12 @@ func (dn *DataNode) DeltaUpdateVolumes(newVolumes, deletedVolumes []storage.Volu
 }
 
 func (dn *DataNode) AdjustMaxVolumeCounts(maxVolumeCounts map[string]uint32) {
-	deltaDiskUsages := newDiskUsages()
 	for diskType, maxVolumeCount := range maxVolumeCounts {
 		if maxVolumeCount == 0 {
 			// the volume server may have set the max to zero
 			continue
 		}
+		deltaDiskUsages := newDiskUsages()
 		dt := types.ToDiskType(diskType)
 		currentDiskUsage := dn.diskUsages.getOrCreateDisk(dt)
 		currentDiskUsageMaxVolumeCount := atomic.LoadInt64(&currentDiskUsage.maxVolumeCount)