diff --git a/lib/validates_timeliness.rb b/lib/validates_timeliness.rb
index 06a66bc..b824c7f 100644
--- a/lib/validates_timeliness.rb
+++ b/lib/validates_timeliness.rb
@@ -45,7 +45,6 @@ module ValidatesTimeliness
     def setup_for_rails
       self.default_timezone = ::ActiveRecord::Base.default_timezone
       self.use_time_zones = ::ActiveRecord::Base.time_zone_aware_attributes rescue false
-      enable_datetime_select_extension!
       load_error_messages
     end
   end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 4d50035..55f542f 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -46,6 +46,8 @@ end
 
 require 'validates_timeliness'
 
+ValidatesTimeliness.enable_datetime_select_extension!
+
 ActiveRecord::Migration.verbose = false
 ActiveRecord::Base.establish_connection({:adapter => 'sqlite3', :database => ':memory:'})