diff --git a/weed-fs/src/cmd/weedvolume/weedvolume.go b/weed-fs/src/cmd/weedvolume/weedvolume.go
index 9d609d8ae..9d07856b8 100644
--- a/weed-fs/src/cmd/weedvolume/weedvolume.go
+++ b/weed-fs/src/cmd/weedvolume/weedvolume.go
@@ -143,7 +143,7 @@ func parseURLPath(path string) (vid, fid, ext string) {
 	ext = ""
 	if dotIndex > 0 {
 		fid = path[commaIndex+1 : dotIndex]
-		ext = path[dotIndex+1:]
+		ext = path[dotIndex:]
 	}
 	return
 }