diff --git a/templates/sshd_config/Debian_lenny.erb b/templates/sshd_config/Debian_lenny.erb
index 18f3e4d..3c3d562 100644
--- a/templates/sshd_config/Debian_lenny.erb
+++ b/templates/sshd_config/Debian_lenny.erb
@@ -173,8 +173,6 @@ AllowAgentForwarding yes
 AllowAgentForwarding no
 <%- end -%>
 
-ChallengeResponseAuthentication no
-
 <%- unless sshd_allowed_users.to_s.empty? then -%>
 AllowUsers <%= sshd_allowed_users -%>
 <%- end -%>