diff --git a/pi.go b/pi.go
index 783f67110e90dc249455d33091936f704db3932b..8e4568558e5c7bef92a2070a431bdb3413662024 100644
--- a/pi.go
+++ b/pi.go
@@ -28,7 +28,7 @@ const (
 // usage prints out anything the caller gives us then bails.
 func usage(e string) {
 	u := "usage: pi [flags] seed nsteps nstep_nprint"
-	if e != ""{
+	if e != "" {
 		fmt.Fprintln(os.Stderr, e+"\n"+u)
 	}
 	flag.Usage()