diff --git a/bar.go b/bar.go
index 2eb74e2..eda7f20 100644
--- a/bar.go
+++ b/bar.go
@@ -78,7 +78,6 @@
 	noPop             bool
 	aDecorators       []decor.Decorator
 	pDecorators       []decor.Decorator
-	mDecorators       []decor.Decorator
 	amountReceivers   []decor.AmountReceiver
 	shutdownListeners []decor.ShutdownListener
 	averageAdjusters  []decor.AverageAdjuster
@@ -196,10 +195,9 @@
 		for _, decorators := range [...][]decor.Decorator{
 			s.pDecorators,
 			s.aDecorators,
-			s.mDecorators,
 		} {
 			for _, d := range decorators {
-				cb(d)
+				cb(extractBaseDecorator(d))
 			}
 		}
 	}
@@ -462,3 +460,10 @@
 		Current:   s.current,
 	}
 }
+
+func extractBaseDecorator(d decor.Decorator) decor.Decorator {
+	if d, ok := d.(decor.Wrapper); ok {
+		return extractBaseDecorator(d.Base())
+	}
+	return d
+}
diff --git a/decor/decorator.go b/decor/decorator.go
index 5190b35..a3d04da 100644
--- a/decor/decorator.go
+++ b/decor/decorator.go
@@ -72,6 +72,14 @@
 type Configurator interface {
 	GetConf() WC
 	SetConf(*WC)
+}
+
+// Wrapper interface.
+// If you're implementing custom Decorator by wrapping a built-in one,
+// it is necessary to implement this interface to retain functionality
+// of built-in Decorator.
+type Wrapper interface {
+	Base() Decorator
 }
 
 // AmountReceiver interface.