data/pieceStore/dataBackend/i.go | 4 ++--

diff --git a/data/pieceStore/dataBackend/i.go b/data/pieceStore/dataBackend/i.go
index 106bea806fc3bcb68b0ff99ff8bb549e6e96674b..2f837eda7e6eab97db9fd5c5a1e3da366bb38278 100644
--- a/data/pieceStore/dataBackend/i.go
+++ b/data/pieceStore/dataBackend/i.go
@@ -1,8 +1,8 @@
 package dataBackend
 
 import (
-	"errors"
 	"io"
+	"os"
 )
 
 // All functions must return ErrNotFound as required.
@@ -13,7 +13,7 @@ 	OpenSection(path string, off, n int64) (io.ReadCloser, error)
 	Delete(path string) error
 }
 
-var ErrNotFound = errors.New("not found")
+var ErrNotFound = os.ErrNotExist
 
 type File interface {
 	io.Closer