diff --git a/etc/ssh/sshd_config b/etc/ssh/sshd_config
index 46bc7a0..ad22e86 100644
--- a/etc/ssh/sshd_config
+++ b/etc/ssh/sshd_config
@@ -98,7 +98,7 @@ AcceptEnv LANG LC_*
 Subsystem       sftp    internal-sftp
 
 # Hardened set of key exchange, cipher, and MAC algorithms, as per <https://www.sshaudit.com/hardening_guides.html>.
-KexAlgorithms curve25519-sha256@libssh.org
+KexAlgorithms curve25519-sha256,curve25519-sha256@libssh.org
 Ciphers chacha20-poly1305@openssh.com,aes256-gcm@openssh.com,aes128-gcm@openssh.com,aes256-ctr,aes192-ctr,aes128-ctr
 MACs hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,umac-128-etm@openssh.com