diff --git a/weed/mount/page_writer/chunk_interval_list.go b/weed/mount/page_writer/chunk_interval_list.go
index e6dc5d1f5..a9d64c8e4 100644
--- a/weed/mount/page_writer/chunk_interval_list.go
+++ b/weed/mount/page_writer/chunk_interval_list.go
@@ -1,6 +1,8 @@
 package page_writer
 
-import "math"
+import (
+	"math"
+)
 
 // ChunkWrittenInterval mark one written interval within one page chunk
 type ChunkWrittenInterval struct {