diff --git a/progress.go b/progress.go
index 3f7fab3..fad1054 100644
--- a/progress.go
+++ b/progress.go
@@ -337,7 +337,7 @@
 		id:       s.idCount,
 		width:    s.width,
 		debugOut: s.debugOut,
-		extender: func(r io.Reader, tw int, st *decor.Statistics) (io.Reader, int) {
+		extender: func(r io.Reader, _ int, _ *decor.Statistics) (io.Reader, int) {
 			return r, 0
 		},
 	}