diff --git a/lib/httpclient/session.rb b/lib/httpclient/session.rb
index b3dedd5d..67e2c3ba 100644
--- a/lib/httpclient/session.rb
+++ b/lib/httpclient/session.rb
@@ -21,7 +21,7 @@
 require 'httpclient/timeout' # TODO: remove this once we drop 1.8 support
 require 'httpclient/ssl_config'
 require 'httpclient/http'
-if RUBY_ENGINE == 'jruby'
+if defined? JRUBY_VERSION
   require 'httpclient/jruby_ssl_socket'
 else
   require 'httpclient/ssl_socket'