diff --git a/bar.go b/bar.go
index efbc5d0..7aeb8c2 100644
--- a/bar.go
+++ b/bar.go
@@ -44,8 +44,8 @@
 type extFunc func(in io.Reader, reqWidth int, st decor.Statistics) (out io.Reader, lines int)
 
 type bState struct {
-	filler            BarFiller
 	id                int
+	priority          int
 	reqWidth          int
 	total             int64
 	current           int64
@@ -56,6 +56,7 @@
 	toComplete        bool
 	completeFlushed   bool
 	ignoreComplete    bool
+	dropOnComplete    bool
 	noPop             bool
 	aDecorators       []decor.Decorator
 	pDecorators       []decor.Decorator
@@ -63,12 +64,10 @@
 	ewmaDecorators    []decor.EwmaDecorator
 	shutdownListeners []decor.ShutdownListener
 	bufP, bufB, bufA  *bytes.Buffer
+	filler            BarFiller
+	middleware        func(BarFiller) BarFiller
 	extender          extFunc
 
-	// priority overrides *Bar's priority, if set
-	priority int
-	// dropOnComplete propagates to *Bar
-	dropOnComplete bool
 	// runningBar is a key for *pState.parkedBars
 	runningBar *Bar
 
diff --git a/bar_option.go b/bar_option.go
index 866772b..31b7939 100644
--- a/bar_option.go
+++ b/bar_option.go
@@ -91,7 +91,7 @@
 // BarFillerMiddleware provides a way to augment default BarFiller.
 func BarFillerMiddleware(middle func(BarFiller) BarFiller) BarOption {
 	return func(s *bState) {
-		s.filler = middle(s.filler)
+		s.middleware = middle
 	}
 }
 
diff --git a/progress.go b/progress.go
index 5a46f24..4b21faf 100644
--- a/progress.go
+++ b/progress.go
@@ -339,21 +339,23 @@
 
 func (s *pState) makeBarState(total int64, filler BarFiller, options ...BarOption) *bState {
 	bs := &bState{
+		id:       s.idCount,
+		priority: s.idCount,
+		reqWidth: s.reqWidth,
 		total:    total,
 		filler:   filler,
-		priority: s.idCount,
-		id:       s.idCount,
-		reqWidth: s.reqWidth,
+		extender: func(r io.Reader, _ int, _ decor.Statistics) (io.Reader, int) { return r, 0 },
 		debugOut: s.debugOut,
-		extender: func(r io.Reader, _ int, _ decor.Statistics) (io.Reader, int) {
-			return r, 0
-		},
 	}
 
 	for _, opt := range options {
 		if opt != nil {
 			opt(bs)
 		}
+	}
+
+	if bs.middleware != nil {
+		bs.filler = bs.middleware(filler)
 	}
 
 	if s.popCompleted && !bs.noPop {