diff --git a/ext/puma_http11/mini_ssl.c b/ext/puma_http11/mini_ssl.c
index 6974b6349c..2d22be2395 100644
--- a/ext/puma_http11/mini_ssl.c
+++ b/ext/puma_http11/mini_ssl.c
@@ -608,7 +608,10 @@ void Init_mini_ssl(VALUE puma) {
   ERR_load_crypto_strings();
 
   mod = rb_define_module_under(puma, "MiniSSL");
+
   eng = rb_define_class_under(mod, "Engine", rb_cObject);
+  rb_undef_alloc_func(eng);
+
   sslctx = rb_define_class_under(mod, "SSLContext", rb_cObject);
   rb_define_alloc_func(sslctx, sslctx_alloc);
   rb_define_method(sslctx, "initialize", sslctx_initialize, 1);
diff --git a/test/test_puma_server_ssl.rb b/test/test_puma_server_ssl.rb
index 2a4f922390..58fd650773 100644
--- a/test/test_puma_server_ssl.rb
+++ b/test/test_puma_server_ssl.rb
@@ -349,7 +349,6 @@ def test_server_ssl_with_cert_pem_and_key_pem
     events = SSLEventsHelper.new STDOUT, STDERR
     server = Puma::Server.new app, events
     server.add_ssl_listener host, port, ctx
-    host_addrs = server.binder.ios.map { |io| io.to_io.addr[2] }
     server.run
 
     http = Net::HTTP.new host, server.connected_ports[0]