diff --git a/mem/file.go b/mem/file.go
index 7c08522..290369a 100644
--- a/mem/file.go
+++ b/mem/file.go
@@ -22,10 +22,9 @@ import (
 	"path/filepath"
 	"sync"
 	"sync/atomic"
+	"time"
 )
 
-import "time"
-
 const FilePathSeparator = string(filepath.Separator)
 
 type File struct {
@@ -105,7 +104,7 @@ func SetUID(f *FileData, uid int) {
 
 func SetGID(f *FileData, gid int) {
 	f.Lock()
-	f.uid = gid
+	f.gid = gid
 	f.Unlock()
 }