diff --git a/lib/rack-timeout.rb b/lib/rack-timeout.rb
index 999abcf..baaca9a 100644
--- a/lib/rack-timeout.rb
+++ b/lib/rack-timeout.rb
@@ -1,2 +1,2 @@
 require_relative "rack/timeout/base"
-require_relative "rack/timeout/rails" if defined?(Rails) && Rails::VERSION::MAJOR >= 3
+require_relative "rack/timeout/rails" if defined?(Rails) && Rails.const_defined?(:VERSION) && Rails::VERSION::MAJOR >= 3