diff --git a/src/documentation/haiku_book/Haiku_Book.xml b/src/documentation/haiku_book/Haiku_Book.xml
index 87e592455d..69d84c2347 100644
--- a/src/documentation/haiku_book/Haiku_Book.xml
+++ b/src/documentation/haiku_book/Haiku_Book.xml
@@ -44,7 +44,6 @@
 				<surname>Hollemans</surname>
 			</author>
 		</authorgroup>
-		</authorgroup>
 
     	<abstract>
 			<para>