diff --git a/.rubocop_todo.yml b/.rubocop_todo.yml
index 75a4275..e91782a 100644
--- a/.rubocop_todo.yml
+++ b/.rubocop_todo.yml
@@ -96,20 +96,6 @@ Style/ClassAndModuleChildren:
     - 'app/models/notification_services/webhook_service.rb'
     - 'config/initializers/overrides.rb'
 
-# Offense count: 23
-Style/ConstantName:
-  Exclude:
-    - 'app/models/notification_service.rb'
-    - 'app/models/notification_services/campfire_service.rb'
-    - 'app/models/notification_services/flowdock_service.rb'
-    - 'app/models/notification_services/gtalk_service.rb'
-    - 'app/models/notification_services/hipchat_service.rb'
-    - 'app/models/notification_services/hoiio_service.rb'
-    - 'app/models/notification_services/hubot_service.rb'
-    - 'app/models/notification_services/pushover_service.rb'
-    - 'app/models/notification_services/slack_service.rb'
-    - 'app/models/notification_services/webhook_service.rb'
-
 # Offense count: 70
 # Configuration parameters: Exclude.
 Style/Documentation:
diff --git a/app/models/notification_service.rb b/app/models/notification_service.rb
index 1ef6cb2..8cb3877 100644
--- a/app/models/notification_service.rb
+++ b/app/models/notification_service.rb
@@ -18,13 +18,13 @@ class NotificationService
   validate :check_params
 
   if Errbit::Config.per_app_notify_at_notices
-    Fields = [[:notify_at_notices,
+    FIELDS = [[:notify_at_notices,
                { :placeholder => 'comma separated numbers or simply 0 for every notice',
                  :label => 'notify on errors (0 for all errors)'
                }
               ]]
   else
-    Fields = []
+    FIELDS = []
   end
 
   def notify_at_notices
@@ -54,9 +54,9 @@ class NotificationService
   end
 
   # Retrieve tracker label from either class or instance.
-  Label = ''
+  LABEL = ''
   def self.label
-    self::Label
+    self::LABEL
   end
 
   def label
diff --git a/app/models/notification_services/campfire_service.rb b/app/models/notification_services/campfire_service.rb
index 3886f9c..f6a2922 100644
--- a/app/models/notification_services/campfire_service.rb
+++ b/app/models/notification_services/campfire_service.rb
@@ -1,7 +1,7 @@
 if defined? Campy
   class NotificationServices::CampfireService < NotificationService
-    Label = "campfire"
-    Fields += [
+    LABEL = "campfire"
+    FIELDS += [
       [:subdomain, {
         :label       => "Subdomain",
         :placeholder => "subdomain from http://{{subdomain}}.campfirenow.com"
@@ -17,7 +17,7 @@ if defined? Campy
     ]
 
     def check_params
-      if Fields.detect {|f| self[f[0]].blank? }
+      if FIELDS.detect {|f| self[f[0]].blank? }
         errors.add :base, 'You must specify your Campfire Subdomain, API token and Room ID'
       end
     end
diff --git a/app/models/notification_services/flowdock_service.rb b/app/models/notification_services/flowdock_service.rb
index da2dfe8..524997a 100644
--- a/app/models/notification_services/flowdock_service.rb
+++ b/app/models/notification_services/flowdock_service.rb
@@ -1,7 +1,7 @@
 if defined? Flowdock
   class NotificationServices::FlowdockService < NotificationService
-    Label = 'flowdock'
-    Fields += [
+    LABEL = 'flowdock'
+    FIELDS += [
       [
         :api_token, {
           :label       => 'Flow API Token',
@@ -11,7 +11,7 @@ if defined? Flowdock
     ]
 
     def check_params
-      if Fields.any? { |f, _| self[f].blank? }
+      if FIELDS.any? { |f, _| self[f].blank? }
         errors.add :base, 'You must specify your Flowdock(Flow) API token'
       end
     end
diff --git a/app/models/notification_services/gtalk_service.rb b/app/models/notification_services/gtalk_service.rb
index 9241abd..c9966e5 100644
--- a/app/models/notification_services/gtalk_service.rb
+++ b/app/models/notification_services/gtalk_service.rb
@@ -1,6 +1,6 @@
 class NotificationServices::GtalkService < NotificationService
-  Label = "gtalk"
-  Fields += [
+  LABEL = "gtalk"
+  FIELDS += [
     [:subdomain, {
       :placeholder => "username@example.com",
       :label       => "Username"
@@ -28,7 +28,7 @@ class NotificationServices::GtalkService < NotificationService
   ]
 
   def check_params
-    if Fields.detect { |f| self[f[0]].blank? && self[f[2]].blank? }
+    if FIELDS.detect { |f| self[f[0]].blank? && self[f[2]].blank? }
       errors.add :base,
         """You must specify your Username, Password, service, service_url
            and either rooms or users to send to or both"""
diff --git a/app/models/notification_services/hipchat_service.rb b/app/models/notification_services/hipchat_service.rb
index 987b9ca..4852c7f 100644
--- a/app/models/notification_services/hipchat_service.rb
+++ b/app/models/notification_services/hipchat_service.rb
@@ -1,7 +1,7 @@
 if defined? HipChat
   class NotificationServices::HipchatService < NotificationService
-    Label = 'hipchat'
-    Fields += [
+    LABEL = 'hipchat'
+    FIELDS += [
       [:service, {
         :placeholder => "'v1' (admin API token) or 'v2' (account API token)",
         :label       => "HipChat API version"
@@ -19,17 +19,17 @@ if defined? HipChat
         :label       => "Room name"
       }]
     ]
-    Mandatory_fields = [:service, :api_token, :room_id]
-    API_versions = %w(v1 v2)
+    MANDATORY_FIELDS = [:service, :api_token, :room_id]
+    API_VERSIONS = %w(v1 v2)
 
     def check_params
-      Fields.each do |field, hash|
-        if Mandatory_fields.include?(field) && self[field].blank?
+      FIELDS.each do |field, hash|
+        if MANDATORY_FIELDS.include?(field) && self[field].blank?
           errors.add field, "You must specify #{hash[:label]}"
         end
       end
-      unless API_versions.include?(self[:service])
-        errors.add :service, "API version must be #{API_versions.join(' or ')}"
+      unless API_VERSIONS.include?(self[:service])
+        errors.add :service, "API version must be #{API_VERSIONS.join(' or ')}"
       end
     end
 
diff --git a/app/models/notification_services/hoiio_service.rb b/app/models/notification_services/hoiio_service.rb
index 3106c71..72b614d 100644
--- a/app/models/notification_services/hoiio_service.rb
+++ b/app/models/notification_services/hoiio_service.rb
@@ -1,6 +1,6 @@
 class NotificationServices::HoiioService < NotificationService
-  Label = "hoiio"
-  Fields += [
+  LABEL = "hoiio"
+  FIELDS += [
     [:api_token, {
       :placeholder => "App ID",
       :label => "App ID"
@@ -16,7 +16,7 @@ class NotificationServices::HoiioService < NotificationService
   ]
 
   def check_params
-    if Fields.detect {|f| self[f[0]].blank? }
+    if FIELDS.detect {|f| self[f[0]].blank? }
       errors.add :base, 'You must specify your App ID, Access Token and Recipient\'s phone numbers'
     end
   end
diff --git a/app/models/notification_services/hubot_service.rb b/app/models/notification_services/hubot_service.rb
index cc0f944..13b9d48 100644
--- a/app/models/notification_services/hubot_service.rb
+++ b/app/models/notification_services/hubot_service.rb
@@ -1,6 +1,6 @@
 class NotificationServices::HubotService < NotificationService
-  Label = "hubot"
-  Fields += [
+  LABEL = "hubot"
+  FIELDS += [
     [:api_token, {
       :placeholder => 'http://hubot.example.org:8080/hubot/say',
       :label => 'Hubot URL'
@@ -12,7 +12,7 @@ class NotificationServices::HubotService < NotificationService
   ]
 
   def check_params
-    if Fields.detect {|f| self[f[0]].blank? }
+    if FIELDS.detect {|f| self[f[0]].blank? }
       errors.add :base, 'You must specify the URL of your hubot'
     end
   end
diff --git a/app/models/notification_services/pushover_service.rb b/app/models/notification_services/pushover_service.rb
index a1867f9..b0a7d8b 100644
--- a/app/models/notification_services/pushover_service.rb
+++ b/app/models/notification_services/pushover_service.rb
@@ -1,6 +1,6 @@
 class NotificationServices::PushoverService < NotificationService
-  Label = "pushover"
-  Fields += [
+  LABEL = "pushover"
+  FIELDS += [
     [:api_token, {
       :placeholder => "User Key",
       :label => "User Key"
@@ -12,7 +12,7 @@ class NotificationServices::PushoverService < NotificationService
   ]
 
   def check_params
-    if Fields.detect {|f| self[f[0]].blank? }
+    if FIELDS.detect {|f| self[f[0]].blank? }
       errors.add :base, 'You must specify your User Key and Application API Token.'
     end
   end
diff --git a/app/models/notification_services/slack_service.rb b/app/models/notification_services/slack_service.rb
index f16457b..95a33f4 100644
--- a/app/models/notification_services/slack_service.rb
+++ b/app/models/notification_services/slack_service.rb
@@ -1,6 +1,6 @@
 class NotificationServices::SlackService < NotificationService
-  Label = "slack"
-  Fields += [
+  LABEL = "slack"
+  FIELDS += [
     [:service_url, {
       :placeholder => 'Slack Hook URL (https://hooks.slack.com/services/XXXXXXXXX/XXXXXXXXX/XXXXXXXXX)',
       :label => 'Hook URL'
@@ -8,7 +8,7 @@ class NotificationServices::SlackService < NotificationService
   ]
 
   def check_params
-    if Fields.detect {|f| self[f[0]].blank? }
+    if FIELDS.detect {|f| self[f[0]].blank? }
       errors.add :base, "You must specify your Slack Hook url."
     end
   end
diff --git a/app/models/notification_services/webhook_service.rb b/app/models/notification_services/webhook_service.rb
index 6d5b999..4225026 100644
--- a/app/models/notification_services/webhook_service.rb
+++ b/app/models/notification_services/webhook_service.rb
@@ -1,6 +1,6 @@
 class NotificationServices::WebhookService < NotificationService
-  Label = "webhook"
-  Fields = [
+  LABEL = "webhook"
+  FIELDS = [
     [:api_token, {
       :placeholder => 'URL to receive a POST request when an error occurs',
       :label => 'URL'
@@ -8,7 +8,7 @@ class NotificationServices::WebhookService < NotificationService
   ]
 
   def check_params
-    if Fields.detect {|f| self[f[0]].blank? }
+    if FIELDS.detect {|f| self[f[0]].blank? }
       errors.add :base, 'You must specify the URL'
     end
   end
diff --git a/app/views/apps/_service_notification_fields.html.haml b/app/views/apps/_service_notification_fields.html.haml
index 430a252..5b61fb5 100644
--- a/app/views/apps/_service_notification_fields.html.haml
+++ b/app/views/apps/_service_notification_fields.html.haml
@@ -14,7 +14,7 @@
       %div.notification_params.none{:class => (w.object && !(w.object.class < NotificationService)) ? 'chosen' : nil}
       - NotificationService.subclasses.each do |notification_service|
         %div.notification_params{:class => (w.object.is_a?(notification_service) ? 'chosen ' : '') << notification_service.label}
-          - notification_service::Fields.each do |field, field_info|
+          - notification_service::FIELDS.each do |field, field_info|
             = w.label field, field_info[:label] || field.to_s.titleize
             - field_type = field == :password ? :password_field : :text_field
             - value = field == :notify_at_notices ? w.object.notify_at_notices.join(", ") : w.object.send(field)
diff --git a/spec/decorators/issue_tracker_type_decorator_spec.rb b/spec/decorators/issue_tracker_type_decorator_spec.rb
index f45e604..1f49363 100644
--- a/spec/decorators/issue_tracker_type_decorator_spec.rb
+++ b/spec/decorators/issue_tracker_type_decorator_spec.rb
@@ -41,7 +41,7 @@ describe IssueTrackerDecorator do
   end
 
   describe "#fields" do
-    it 'return all Fields define decorate' do
+    it 'return all FIELDS define decorate' do
       decorator.fields do |itf|
         expect(itf).to be_a(IssueTrackerFieldDecorator)
         expect([:foo, :bar]).to be_include(itf.object)
--
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