diff --git a/contrib/oauth2-proxy.service.example b/contrib/oauth2-proxy.service.example
index 7bfc79b5..9616987c 100644
--- a/contrib/oauth2-proxy.service.example
+++ b/contrib/oauth2-proxy.service.example
@@ -12,7 +12,7 @@ After=syslog.target network.target
 User=www-data
 Group=www-data
 
-ExecStart=/usr/local/bin/oauth2-proxy -config=/etc/oauth2-proxy.cfg
+ExecStart=/usr/local/bin/oauth2-proxy --config=/etc/oauth2-proxy.cfg
 ExecReload=/bin/kill -HUP $MAINPID
 
 KillMode=process