diff --git a/geocoder.gemspec b/geocoder.gemspec
index 07899f9fa890f3eb9101af18b83b6408e4710ff3..ed30cdcecb61c8e5b7e71ed8f65f7d3ed248917c 100644
--- a/geocoder.gemspec
+++ b/geocoder.gemspec
@@ -1,5 +1,6 @@
 # -*- encoding: utf-8 -*-
 $:.push File.expand_path("../lib", __FILE__)
+require 'date'
 require "geocoder/version"
 
 Gem::Specification.new do |s|