diff --git a/decor/eta.go b/decor/eta.go
index c05c59d..308f203 100644
--- a/decor/eta.go
+++ b/decor/eta.go
@@ -84,6 +84,7 @@
 	} else {
 		durPerItem := float64(d.zDur+dur) / float64(n)
 		if math.IsInf(durPerItem, 0) || math.IsNaN(durPerItem) {
+			d.zDur += dur
 			return
 		}
 		d.zDur = 0
diff --git a/decor/speed.go b/decor/speed.go
index 9db4ea8..b867e5d 100644
--- a/decor/speed.go
+++ b/decor/speed.go
@@ -99,6 +99,7 @@
 	} else {
 		durPerByte := float64(d.zDur+dur) / float64(n)
 		if math.IsInf(durPerByte, 0) || math.IsNaN(durPerByte) {
+			d.zDur += dur
 			return
 		}
 		d.zDur = 0