diff --git a/asciidoc/templates/book/document.html.slim b/asciidoc/templates/book/document.html.slim
index 60f33b86..8da2d349 100644
--- a/asciidoc/templates/book/document.html.slim
+++ b/asciidoc/templates/book/document.html.slim
@@ -44,7 +44,7 @@ html lang=(attr :lang, 'en' unless attr? :nolang)
         i
           | Copyright © 2007 -
           = " " + Time.now.year.to_s + " "
-          | The Apache Software Foundation, Licensed under the
+          ' The Apache Software Foundation, Licensed under the
           a href="http://www.apache.org/licenses/" Apache License, Version 2.0
           | .
         br/