diff --git a/lib/mongoid/fields/validators/macro.rb b/lib/mongoid/fields/validators/macro.rb
index <HASH>..<HASH> 100644
--- a/lib/mongoid/fields/validators/macro.rb
+++ b/lib/mongoid/fields/validators/macro.rb
@@ -56,7 +56,7 @@ module Mongoid
           end
 
           # if field alredy defined
-          if ! options[:overwrite] && klass.fields.keys.include?(name.to_s)
+          if !options[:overwrite] && klass.fields.keys.include?(name.to_s)
             if Mongoid.duplicate_fields_exception
               raise Errors::InvalidField.new(klass, name)
             else
:scissors: