diff --git a/lib/mongoid/enum.rb b/lib/mongoid/enum.rb
index ac9a5f0..19b78b1 100644
--- a/lib/mongoid/enum.rb
+++ b/lib/mongoid/enum.rb
@@ -1,5 +1,6 @@
 require "mongoid/enum/version"
 require "mongoid/enum/validators/multiple_validator"
+require "mongoid/enum/configuration"
 
 module Mongoid
   module Enum
@@ -7,7 +8,7 @@ module Mongoid
     module ClassMethods
 
       def enum(name, values, options = {})
-        field_name = :"_#{name}"
+        field_name = :"#{Mongoid::Enum.configuration.field_name_prefix}#{name}"
         options = default_options(values).merge(options)
 
         set_values_constant name, values
diff --git a/lib/mongoid/enum/configuration.rb b/lib/mongoid/enum/configuration.rb
new file mode 100644
index 0000000..ed45df4
--- /dev/null
+++ b/lib/mongoid/enum/configuration.rb
@@ -0,0 +1,19 @@
+module Mongoid
+  module Enum
+    class Configuration
+      attr_accessor :field_name_prefix
+
+      def initialize
+        self.field_name_prefix = "_"
+      end
+    end
+
+    def self.configuration
+      @configuration ||= Configuration.new
+    end
+
+    def self.configure
+      yield(configuration) if block_given?
+    end
+  end
+end
diff --git a/spec/mongoid/configuration_spec.rb b/spec/mongoid/configuration_spec.rb
new file mode 100644
index 0000000..db04d68
--- /dev/null
+++ b/spec/mongoid/configuration_spec.rb
@@ -0,0 +1,11 @@
+require 'spec_helper'
+
+describe Mongoid::Enum::Configuration do
+  subject { Mongoid::Enum::Configuration.new }
+
+  describe "field_name_prefix" do
+    it "has '_' as default value" do
+      expect(subject.field_name_prefix).to eq "_"
+    end
+  end
+end
diff --git a/spec/mongoid/enum/validators/multiple_validator_spec.rb b/spec/mongoid/enum/validators/multiple_validator_spec.rb
index 7791dc3..d47c605 100644
--- a/spec/mongoid/enum/validators/multiple_validator_spec.rb
+++ b/spec/mongoid/enum/validators/multiple_validator_spec.rb
@@ -16,14 +16,14 @@ describe Mongoid::Enum::Validators::MultipleValidator do
       context "and value is nil" do
         before(:each) { validator.validate_each(record, attribute, nil) }
         it "validates" do
-          expect(record.errors[attribute].empty?).to be_true
+          expect(record.errors[attribute].empty?).to be true
         end
       end
 
       context "and value is []" do
         before(:each) { validator.validate_each(record, attribute, []) }
         it "validates" do
-          expect(record.errors[attribute].empty?).to be_true
+          expect(record.errors[attribute].empty?).to be true
         end
       end
     end
@@ -32,14 +32,14 @@ describe Mongoid::Enum::Validators::MultipleValidator do
       context "and value is nil" do
         before(:each) { validator.validate_each(record, attribute, nil) }
         it "won't validate" do
-          expect(record.errors[attribute].any?).to be_true
+          expect(record.errors[attribute].any?).to be true
           expect(record.errors[attribute]).to eq ["is not in #{values.join ", "}"]
         end
       end
       context "and value is []" do
         before(:each) { validator.validate_each(record, attribute, []) }
         it "won't validate" do
-          expect(record.errors[attribute].any?).to be_true
+          expect(record.errors[attribute].any?).to be true
           expect(record.errors[attribute]).to eq ["is not in #{values.join ", "}"]
         end
       end
@@ -49,7 +49,7 @@ describe Mongoid::Enum::Validators::MultipleValidator do
       let(:allow_nil) { rand(2).zero? }
       before(:each) { validator.validate_each(record, attribute, [values.sample]) }
       it "validates" do
-        expect(record.errors[attribute].empty?).to be_true
+        expect(record.errors[attribute].empty?).to be true
       end
     end
 
@@ -57,7 +57,7 @@ describe Mongoid::Enum::Validators::MultipleValidator do
       let(:allow_nil) { rand(2).zero? }
       before(:each) { validator.validate_each(record, attribute, [:amet]) }
       it "won't validate" do
-        expect(record.errors[attribute].any?).to be_true
+        expect(record.errors[attribute].any?).to be true
       end
     end
 
@@ -65,7 +65,7 @@ describe Mongoid::Enum::Validators::MultipleValidator do
       let(:allow_nil) { rand(2).zero? }
       before(:each) { validator.validate_each(record, attribute, [values.first, values.last]) }
       it "validates" do
-        expect(record.errors[attribute].empty?).to be_true
+        expect(record.errors[attribute].empty?).to be true
       end
     end
 
@@ -73,7 +73,7 @@ describe Mongoid::Enum::Validators::MultipleValidator do
       let(:allow_nil) { rand(2).zero? }
       before(:each) { validator.validate_each(record, attribute, [values.first, values.last, :amet]) }
       it "won't validate" do
-        expect(record.errors[attribute].any?).to be_true
+        expect(record.errors[attribute].any?).to be true
       end
     end
   end
diff --git a/spec/mongoid/enum_spec.rb b/spec/mongoid/enum_spec.rb
index 84e752d..e551df2 100644
--- a/spec/mongoid/enum_spec.rb
+++ b/spec/mongoid/enum_spec.rb
@@ -1,4 +1,5 @@
 require 'spec_helper'
+require 'mongoid/enum/configuration'
 
 class User
   include Mongoid::Document
@@ -21,6 +22,23 @@ describe Mongoid::Enum do
       expect(klass).to have_field(field_name)
     end
 
+    it "uses prefix defined in configuration" do
+      old_field_name_prefix = Mongoid::Enum.configuration.field_name_prefix
+      Mongoid::Enum.configure do |config|
+        config.field_name_prefix = "___"
+      end
+      UserWithoutPrefix = Class.new do
+        include Mongoid::Document
+        include Mongoid::Enum
+
+        enum :status, [:awaiting_approval, :approved, :banned]
+      end
+      expect(UserWithoutPrefix).to have_field "___status"
+      Mongoid::Enum.configure do |config|
+        config.field_name_prefix = old_field_name_prefix
+      end
+    end
+
     it "is aliased" do
       expect(instance).to respond_to alias_name
       expect(instance).to respond_to :"#{alias_name}="
@@ -56,7 +74,7 @@ describe Mongoid::Enum do
     end
   end
 
-  describe "accessors"do
+  describe "accessors" do
     context "when singular" do
       describe "{{value}}!" do
         it "sets the value" do
@@ -111,15 +129,15 @@ describe Mongoid::Enum do
             instance.save
             instance.author!
             instance.editor!
-            expect(instance.editor?).to be_true
-            expect(instance.author?).to be_true
+            expect(instance.editor?).to be true
+            expect(instance.author?).to be true
           end
         end
 
         context "when {{enum}} does not contain {{value}}" do
           it "returns false" do
             instance.save
-            expect(instance.author?).to be_false
+            expect(instance.author?).to be false
           end
         end
       end
@@ -174,4 +192,21 @@ describe Mongoid::Enum do
       end
     end
   end
+
+  describe ".configuration" do
+    it "returns Configuration object" do
+      expect(Mongoid::Enum.configuration)
+          .to be_instance_of Mongoid::Enum::Configuration
+    end
+    it "returns same object when called multiple times" do
+      expect(Mongoid::Enum.configuration).to be Mongoid::Enum.configuration
+    end
+  end
+
+  describe ".configure" do
+    it "yields configuration if block is given" do
+      expect { |b| Mongoid::Enum.configure &b }
+          .to yield_with_args Mongoid::Enum.configuration
+    end
+  end
 end