diff --git a/.rubocop.yml b/.rubocop.yml
index 8c8a4d7f4..982ce1c25 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -154,6 +154,14 @@ Style/ClassAndModuleChildren:
   Description: 'Checks style of children classes and modules.'
   Enabled: false
 
+Style/FileName:
+  Description: 'Use snake_case for source file names.'
+  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#snake-case-files'
+  Enabled: true
+  Exclude:
+    - 'script/websocket-server.rb'
+
+
 # 2.0
 
 Metrics/PerceivedComplexity:
diff --git a/script/websocket-server.rb b/script/websocket-server.rb
index b4b29f331..7b6c52cec 100755
--- a/script/websocket-server.rb
+++ b/script/websocket-server.rb
@@ -1,6 +1,7 @@
 #!/usr/bin/env ruby
 # Copyright (C) 2012-2013 Zammad Foundation, http://zammad-foundation.org/
-# rubocop:disable Style/FileName, Rails/TimeZone
+# rubocop:disable Rails/TimeZone
+
 $LOAD_PATH << './lib'
 require 'rubygems'
 require 'eventmachine'