diff --git a/share/xml/docbook50.dtd b/share/xml/docbook50.dtd
index dea487b24c..6784b066ba 100644
--- a/share/xml/docbook50.dtd
+++ b/share/xml/docbook50.dtd
@@ -15,7 +15,7 @@
 	xmlns:xi	CDATA	#FIXED	"http://www.w3.org/2001/XInclude"
 >
 
-<!ELEMENT buildtarget (#PCDATA|replaceable)>
+<!ELEMENT buildtarget (#PCDATA|replaceable)*>
 
 <!ENTITY % db.common.attributes "
 	xml:id	ID	#IMPLIED