diff --git a/components/engine/cmd/dockerd/daemon.go b/components/engine/cmd/dockerd/daemon.go
index be8025fd98..0df59cadfc 100644
--- a/components/engine/cmd/dockerd/daemon.go
+++ b/components/engine/cmd/dockerd/daemon.go
@@ -227,7 +227,7 @@ func (cli *DaemonCli) start(opts daemonOptions) (err error) {
 
 		// It's a bad idea to bind to TCP without tlsverify.
 		if proto == "tcp" && (serverConfig.TLSConfig == nil || serverConfig.TLSConfig.ClientAuth != tls.RequireAndVerifyClientCert) {
-			logrus.Warn("[!] DON'T BIND ON ANY IP ADDRESS WITHOUT setting -tlsverify IF YOU DON'T KNOW WHAT YOU'RE DOING [!]")
+			logrus.Warn("[!] DON'T BIND ON ANY IP ADDRESS WITHOUT setting --tlsverify IF YOU DON'T KNOW WHAT YOU'RE DOING [!]")
 		}
 		ls, err := listeners.Init(proto, addr, serverConfig.SocketGroup, serverConfig.TLSConfig)
 		if err != nil {