diff --git a/bar.go b/bar.go
index 82ba69e..7db860e 100644
--- a/bar.go
+++ b/bar.go
@@ -54,12 +54,8 @@
 	buffers           [3]*bytes.Buffer
 	filler            BarFiller
 	middleware        func(BarFiller) BarFiller
+	extender          extenderFunc
 	debugOut          io.Writer
-
-	extender struct {
-		fn  extenderFunc
-		rev bool
-	}
 
 	wait struct {
 		bar  *Bar // key for (*pState).queueBars
@@ -384,16 +380,11 @@
 					}
 				}
 				s.aborted = !s.completed
-				s.extender.fn = makePanicExtender(p)
+				s.extender = makePanicExtender(p)
 				b.recoveredPanic = p
 			}
-			if fn := s.extender.fn; fn != nil {
+			if fn := s.extender; fn != nil {
 				rows = fn(rows, s.reqWidth, stat)
-				if s.extender.rev {
-					for left, right := 0, len(rows)-1; left < right; left, right = left+1, right-1 {
-						rows[left], rows[right] = rows[right], rows[left]
-					}
-				}
 			}
 			frame := &renderFrame{
 				rows: rows,
@@ -414,13 +405,8 @@
 		if b.recoveredPanic == nil {
 			rows = append(rows, s.draw(stat))
 		}
-		if fn := s.extender.fn; fn != nil {
+		if fn := s.extender; fn != nil {
 			rows = fn(rows, s.reqWidth, stat)
-			if s.extender.rev {
-				for left, right := 0, len(rows)-1; left < right; left, right = left+1, right-1 {
-					rows[left], rows[right] = rows[right], rows[left]
-				}
-			}
 		}
 		frame := &renderFrame{
 			rows: rows,
diff --git a/bar_option.go b/bar_option.go
index d2233d4..3506ed2 100644
--- a/bar_option.go
+++ b/bar_option.go
@@ -138,14 +138,13 @@
 		return nil
 	}
 	return func(s *bState) {
-		s.extender.fn = makeExtenderFunc(filler)
-		s.extender.rev = rev
-	}
-}
-
-func makeExtenderFunc(filler BarFiller) extenderFunc {
+		s.extender = makeExtenderFunc(filler, rev)
+	}
+}
+
+func makeExtenderFunc(filler BarFiller, rev bool) extenderFunc {
 	buf := new(bytes.Buffer)
-	return func(rows []io.Reader, width int, stat decor.Statistics) []io.Reader {
+	base := func(rows []io.Reader, width int, stat decor.Statistics) []io.Reader {
 		buf.Reset()
 		filler.Fill(buf, width, stat)
 		for {
@@ -157,6 +156,18 @@
 		}
 		return rows
 	}
+
+	if !rev {
+		return base
+	} else {
+		return func(rows []io.Reader, width int, stat decor.Statistics) []io.Reader {
+			rows = base(rows, width, stat)
+			for left, right := 0, len(rows)-1; left < right; left, right = left+1, right-1 {
+				rows[left], rows[right] = rows[right], rows[left]
+			}
+			return rows
+		}
+	}
 }
 
 // BarFillerTrim removes leading and trailing space around the underlying BarFiller.