diff --git a/certbot.cf b/certbot.cf
index 9111d0d..f051d56 100644
--- a/certbot.cf
+++ b/certbot.cf
@@ -63,6 +63,7 @@ bundle agent certbot_cert(site,webroot)
 vars:
 
 	"domain" string => "$(site[domain])";
+	"keytype" string => "rsa";
 	
 	"ds" slist => {"$(site[domain])"};
 
@@ -70,7 +71,7 @@ vars:
 
 	"site_json" string => storejson(@(site));
 	"args" string => string_mustache(
-			"--cert-name {{domain}} -d {{domain}} {{#aliases}} -d {{.}} {{/aliases}}",
+			"--key-type $(keytype) --cert-name {{domain}} -d {{domain}} {{#aliases}} -d {{.}} {{/aliases}}",
 			@(site)
 			);