diff --git a/sys/xtract.go b/sys/xtract.go
index dd76da4..9d4d57c 100644
--- a/sys/xtract.go
+++ b/sys/xtract.go
@@ -26,8 +26,8 @@ func NewXtract(dir string, outFile string) *Xtract {
 	return &Xtract{dir: dir, outFile: outFile, withBar: false}
 }
 
-func (x *Xtract) AddBar(bar *io.Writer) {
-	x.bar = bar
+func (x *Xtract) AddBar(bar io.Writer) {
+	x.bar = &bar
 	x.withBar = true
 }