diff --git a/bundles/letsencrypt/files/config b/bundles/letsencrypt/files/config
index 2d4b2b6..c551a28 100644
--- a/bundles/letsencrypt/files/config
+++ b/bundles/letsencrypt/files/config
@@ -3,3 +3,4 @@ BASEDIR=/var/lib/dehydrated
 WELLKNOWN="${BASEDIR}/acme-challenges"
 DOMAINS_TXT="/etc/dehydrated/domains.txt"
 HOOK="/etc/dehydrated/hook.sh"
+KEY_ALGO=rsa