diff --git a/decor/speed.go b/decor/speed.go
index bc9550f..f3355c4 100644
--- a/decor/speed.go
+++ b/decor/speed.go
@@ -86,7 +86,7 @@
 	var str string
 	// ewma implementation may return 0 before accumulating certain number of samples
 	if v := d.average.Value(); v != 0 {
-		str = d.producer(float64(1e9) / v)
+		str = d.producer(1e9 / v)
 	} else {
 		str = d.producer(0)
 	}