diff --git a/lib/rack-livereload.rb b/lib/rack-livereload.rb
index 6926f1d..ff8062e 100644
--- a/lib/rack-livereload.rb
+++ b/lib/rack-livereload.rb
@@ -1,6 +1,6 @@
 require "rack/livereload"
 
 class Rack::LiveReload
-  VERSION = '0.3.9'
+  VERSION = '0.4.0'
 end
 
diff --git a/lib/rack/livereload.rb b/lib/rack/livereload.rb
index 803c4c5..31cb54a 100644
--- a/lib/rack/livereload.rb
+++ b/lib/rack/livereload.rb
@@ -77,7 +77,7 @@ module Rack
                 template = ERB.new(::File.read(::File.expand_path('../../../skel/livereload.html.erb', __FILE__)))
 
                 if line['<head']
-                  line.gsub!(/<head[^>]*>/) { |match| %{#{match}#{template.result(binding)}} }
+                  line.gsub!(/<head(\s[^>])*>/) { |match| %{#{match}#{template.result(binding)}} }
                 end
 
                 headers["X-Rack-LiveReload"] = '1'