diff --git a/bar.go b/bar.go
index 58c59a1..efbc5d0 100644
--- a/bar.go
+++ b/bar.go
@@ -44,7 +44,6 @@
 type extFunc func(in io.Reader, reqWidth int, st decor.Statistics) (out io.Reader, lines int)
 
 type bState struct {
-	baseF             BarFiller
 	filler            BarFiller
 	id                int
 	reqWidth          int
diff --git a/bar_option.go b/bar_option.go
index 9a55a8d..866772b 100644
--- a/bar_option.go
+++ b/bar_option.go
@@ -77,19 +77,22 @@
 
 // BarFillerOnComplete replaces bar's filler with message, on complete event.
 func BarFillerOnComplete(message string) BarOption {
-	return func(s *bState) {
-		s.filler = makeBarFillerOnComplete(s.baseF, message)
-	}
-}
-
-func makeBarFillerOnComplete(filler BarFiller, message string) BarFiller {
-	return BarFillerFunc(func(w io.Writer, width int, st decor.Statistics) {
-		if st.Completed {
-			io.WriteString(w, message)
-		} else {
-			filler.Fill(w, width, st)
-		}
+	return BarFillerMiddleware(func(base BarFiller) BarFiller {
+		return BarFillerFunc(func(w io.Writer, reqWidth int, st decor.Statistics) {
+			if st.Completed {
+				io.WriteString(w, message)
+			} else {
+				base.Fill(w, reqWidth, st)
+			}
+		})
 	})
+}
+
+// BarFillerMiddleware provides a way to augment default BarFiller.
+func BarFillerMiddleware(middle func(BarFiller) BarFiller) BarOption {
+	return func(s *bState) {
+		s.filler = middle(s.filler)
+	}
 }
 
 // BarPriority sets bar's priority. Zero is highest priority, i.e. bar
@@ -138,7 +141,7 @@
 		SetStyle(string)
 	}
 	return func(s *bState) {
-		if t, ok := s.baseF.(styleSetter); ok {
+		if t, ok := s.filler.(styleSetter); ok {
 			t.SetStyle(style)
 		}
 	}
@@ -158,7 +161,7 @@
 		SetReverse(bool)
 	}
 	return func(s *bState) {
-		if t, ok := s.baseF.(revSetter); ok {
+		if t, ok := s.filler.(revSetter); ok {
 			t.SetReverse(true)
 		}
 	}
@@ -188,7 +191,7 @@
 	cb func(interface{}),
 ) BarOption {
 	return func(s *bState) {
-		if t, ok := typeChecker(s.baseF); ok {
+		if t, ok := typeChecker(s.filler); ok {
 			cb(t)
 		}
 	}
diff --git a/progress.go b/progress.go
index e9df179..5a46f24 100644
--- a/progress.go
+++ b/progress.go
@@ -340,7 +340,6 @@
 func (s *pState) makeBarState(total int64, filler BarFiller, options ...BarOption) *bState {
 	bs := &bState{
 		total:    total,
-		baseF:    extractBaseFiller(filler),
 		filler:   filler,
 		priority: s.idCount,
 		id:       s.idCount,
@@ -384,13 +383,3 @@
 		}()
 	}
 }
-
-func extractBaseFiller(f BarFiller) BarFiller {
-	type wrapper interface {
-		Base() BarFiller
-	}
-	if f, ok := f.(wrapper); ok {
-		return extractBaseFiller(f.Base())
-	}
-	return f
-}