diff --git a/share/sgml/freebsd.ent b/share/sgml/freebsd.ent
index 9d616661c0..6d235a94db 100644
--- a/share/sgml/freebsd.ent
+++ b/share/sgml/freebsd.ent
@@ -15,7 +15,7 @@
   Use this entity when refering to 'UNIX' in your document.
 -->
 <!ENTITY unix "<trademark class='registered'>UNIX</trademark>">
-<!ENTITY nis "<acronym>NIS</acronym">
+<!ENTITY nis "<acronym>NIS</acronym>">
 
 <!-- This entity should be overridden for the print output case to
      properly render TeX. -->