diff --git a/aws-experiment-launch/experiment/commander/main.go b/aws-experiment-launch/experiment/commander/main.go
index b5243a13d..fb1f3c53f 100644
--- a/aws-experiment-launch/experiment/commander/main.go
+++ b/aws-experiment-launch/experiment/commander/main.go
@@ -184,6 +184,7 @@ func main() {
 	ip := flag.String("ip", "127.0.0.1", "The ip of commander, i.e. this machine")
 	port := flag.String("port", "8080", "The port where you want to host the config file")
 	configFile := flag.String("config_file", "test.txt", "The file name of config file which should be put in the same of folder as commander")
+	flag.Parse()
 
 	config(*ip, *port, *configFile)