diff --git a/decor/eta.go b/decor/eta.go
index c4cb2a1..cbe657f 100644
--- a/decor/eta.go
+++ b/decor/eta.go
@@ -81,15 +81,15 @@
 func (d *movingAverageETA) EwmaUpdate(n int64, dur time.Duration) {
 	if n <= 0 {
 		d.zDur += dur
-	} else {
-		durPerItem := float64(d.zDur+dur) / float64(n)
-		if math.IsInf(durPerItem, 0) || math.IsNaN(durPerItem) {
-			d.zDur += dur
-			return
-		}
-		d.zDur = 0
-		d.average.Add(durPerItem)
-	}
+		return
+	}
+	durPerItem := float64(d.zDur+dur) / float64(n)
+	if math.IsInf(durPerItem, 0) || math.IsNaN(durPerItem) {
+		d.zDur += dur
+		return
+	}
+	d.zDur = 0
+	d.average.Add(durPerItem)
 }
 
 // AverageETA decorator. It's wrapper of NewAverageETA.
diff --git a/decor/speed.go b/decor/speed.go
index a90a8ed..50415fd 100644
--- a/decor/speed.go
+++ b/decor/speed.go
@@ -96,15 +96,15 @@
 func (d *movingAverageSpeed) EwmaUpdate(n int64, dur time.Duration) {
 	if n <= 0 {
 		d.zDur += dur
-	} else {
-		durPerByte := float64(d.zDur+dur) / float64(n)
-		if math.IsInf(durPerByte, 0) || math.IsNaN(durPerByte) {
-			d.zDur += dur
-			return
-		}
-		d.zDur = 0
-		d.average.Add(durPerByte)
+		return
 	}
+	durPerByte := float64(d.zDur+dur) / float64(n)
+	if math.IsInf(durPerByte, 0) || math.IsNaN(durPerByte) {
+		d.zDur += dur
+		return
+	}
+	d.zDur = 0
+	d.average.Add(durPerByte)
 }
 
 // AverageSpeed decorator with dynamic unit measure adjustment. It's