diff --git a/weed/shell/command_ec_common.go b/weed/shell/command_ec_common.go
index 3ca310b5d..b3bd0ce5d 100644
--- a/weed/shell/command_ec_common.go
+++ b/weed/shell/command_ec_common.go
@@ -172,7 +172,7 @@ func countFreeShardSlots(dn *master_pb.DataNodeInfo, diskType types.DiskType) (c
 	if diskInfo == nil {
 		return 0
 	}
-	return int(diskInfo.MaxVolumeCount-diskInfo.ActiveVolumeCount)*erasure_coding.DataShardsCount - countShards(diskInfo.EcShardInfos)
+	return int(diskInfo.MaxVolumeCount-diskInfo.VolumeCount)*erasure_coding.DataShardsCount - countShards(diskInfo.EcShardInfos)
 }
 
 type RackId string