diff --git a/libraries/ssh_crypto.rb b/libraries/ssh_crypto.rb
index e54674c..4ebf900 100644
--- a/libraries/ssh_crypto.rb
+++ b/libraries/ssh_crypto.rb
@@ -247,6 +247,8 @@ def valid_algorithms # rubocop:disable Metrics/CyclomaticComplexity, Metrics/Met
       when /10.10\./, /10.11\./, /10.12\./
         alg66
       end
+    when 'amazon'
+      alg = alg53
     end
 
     alg