diff --git a/lib/geocoder/models/mongoid.rb b/lib/geocoder/models/mongoid.rb
index 763c29830bbc87cb7129832a416c4a270450679a..b1497327f32f583839502e73fca90ba7b7f75bc2 100644
--- a/lib/geocoder/models/mongoid.rb
+++ b/lib/geocoder/models/mongoid.rb
@@ -18,7 +18,7 @@ module Geocoder
         super(options)
         if options[:skip_index] == false
           # create 2d index
-          if (defined? ::Mongoid::VERSION && ::Mongoid::VERSION >= "3")
+          if defined?(::Mongoid::VERSION) && ::Mongoid::VERSION >= "3"
             index({ geocoder_options[:coordinates].to_sym => '2d' }, 
                   {:min => -180, :max => 180})
           else