diff --git a/execjs.gemspec b/execjs.gemspec
index 17f3009..2f228b5 100644
--- a/execjs.gemspec
+++ b/execjs.gemspec
@@ -1,4 +1,5 @@
-require File.expand_path("../lib/execjs/version.rb", __FILE__)
+$:.unshift File.expand_path('..', __FILE__)
+require 'execjs/version'
 
 Gem::Specification.new do |s|
   s.name    = "execjs"