diff --git a/main.go b/main.go
index 783d060..96a2bf1 100644
--- a/main.go
+++ b/main.go
@@ -46,9 +46,14 @@ func newConfig(args []string) (*config, error) {
 
 	fs := flag.NewFlagSet("ryku", flag.PanicOnError)
 	fs.SetOutput(os.Stdout)
+
 	fs.IntVar(&cfg.Port, "p", 8080, "Port to bind at")
 	fs.DurationVar(&cfg.ConnectionTimeout, "timeout", 60*time.Second, "Connection timeout")
-	fs.Parse(args)
+
+	err := fs.Parse(args)
+	if err != nil {
+		return nil, err
+	}
 
 	connectionTimeoutSetByFlag := false
 	fs.Visit(func(f *flag.Flag) {