diff --git a/imaginary.go b/imaginary.go
index 5f8a2ee9..75ecec56 100644
--- a/imaginary.go
+++ b/imaginary.go
@@ -114,7 +114,7 @@ type URLSignature struct {
 
 func main() {
 	flag.Usage = func() {
-		_, _ = fmt.Fprint(os.Stderr, usage, Version, runtime.NumCPU())
+		_, _ = fmt.Fprintf(os.Stderr, usage, Version, runtime.NumCPU())
 	}
 	flag.Parse()