diff --git a/decor/speed.go b/decor/speed.go
index 54bafd5..5258177 100644
--- a/decor/speed.go
+++ b/decor/speed.go
@@ -21,15 +21,15 @@
 //
 //	fmt.Printf("%.1f", FmtAsSpeed(SizeB1024(2048)))
 func FmtAsSpeed(input fmt.Formatter) fmt.Formatter {
-	return speedFormatter{input}
+	return &speedFormatter{input}
 }
 
 type speedFormatter struct {
 	fmt.Formatter
 }
 
-func (self speedFormatter) Format(st fmt.State, verb rune) {
-	self.Formatter.Format(st, verb)
+func (s *speedFormatter) Format(st fmt.State, verb rune) {
+	s.Formatter.Format(st, verb)
 	_, err := io.WriteString(st, "/s")
 	if err != nil {
 		panic(err)