How to fix Setting tune.ssl.default-dh-param to 1024 by default on Haproxy

[root@localhost haproxy]# haproxy -c -V -f /etc/haproxy/haproxy.cfg
[WARNING] 281/142814 (148799) : Setting tune.ssl.default-dh-param to 1024 by default, if your workload permits it you should set it to at least 2048. Please set a value >= 1024 to make this warning disappear.
Configuration file is valid

global
    log 127.0.0.1 local0 notice
    maxconn 2000
    user haproxy
    group haproxy
    ssl-default-bind-options no-sslv3
    tune.ssl.default-dh-param 2048

[root@localhost haproxy]# haproxy -c -V -f /etc/haproxy/haproxy.cfg
Configuration file is valid
[root@localhost haproxy]#