diff --git a/lib/gollum.rb b/lib/gollum.rb
index 1971ac2c..2206ef46 100644
--- a/lib/gollum.rb
+++ b/lib/gollum.rb
@@ -18,7 +18,7 @@ require File.expand_path('../gollum/file', __FILE__)
 require File.expand_path('../gollum/markup', __FILE__)
 require File.expand_path('../gollum/sanitization', __FILE__)
 require File.expand_path('../gollum/tex', __FILE__)
-require File.expand_path('../gollum/websequencediagram', __FILE__)
+require File.expand_path('../gollum/web_sequence_diagram', __FILE__)
 
 module Gollum
   VERSION = '1.3.2'
diff --git a/lib/gollum/websequencediagram.rb b/lib/gollum/web_sequence_diagram.rb
similarity index 100%
rename from lib/gollum/websequencediagram.rb
rename to lib/gollum/web_sequence_diagram.rb