diff --git a/cmd/digraph/digraph.go b/cmd/digraph/digraph.go
index 8ce0e4091c..8ef2e45ef1 100644
--- a/cmd/digraph/digraph.go
+++ b/cmd/digraph/digraph.go
@@ -89,11 +89,12 @@ Example usage:
 `
 
 func main() {
+	flag.Usage = func() { fmt.Fprintln(os.Stderr, Usage) }
 	flag.Parse()
 
 	args := flag.Args()
 	if len(args) == 0 {
-		fmt.Println(Usage)
+		fmt.Fprintln(os.Stderr, Usage)
 		return
 	}