diff --git a/weed/storage/needle/compact_map.go b/weed/storage/needle/compact_map.go
index 63781f6a2..39f80e4d1 100644
--- a/weed/storage/needle/compact_map.go
+++ b/weed/storage/needle/compact_map.go
@@ -5,6 +5,10 @@ import (
 	"sync"
 )
 
+const (
+	batch = 100000
+)
+
 type CompactSection struct {
 	sync.RWMutex
 	values   []NeedleValue
diff --git a/weed/storage/needle/needle_value.go b/weed/storage/needle/needle_value.go
index b15d25245..96ee83009 100644
--- a/weed/storage/needle/needle_value.go
+++ b/weed/storage/needle/needle_value.go
@@ -5,10 +5,6 @@ import (
 	"github.com/google/btree"
 )
 
-const (
-	batch = 100000
-)
-
 type NeedleValue struct {
 	Key    NeedleId
 	Offset Offset `comment:"Volume offset"` //since aligned to 8 bytes, range is 4G*8=32G