diff --git a/weed/shell/command_volume_unmount.go b/weed/shell/command_volume_unmount.go
index 3e0a768d5..4b079b944 100644
--- a/weed/shell/command_volume_unmount.go
+++ b/weed/shell/command_volume_unmount.go
@@ -3,6 +3,7 @@ package shell
 import (
 	"context"
 	"flag"
+	"fmt"
 	"github.com/seaweedfs/seaweedfs/weed/pb"
 	"io"