diff --git a/share/sgml/man-refs.ent b/share/sgml/man-refs.ent
index 76fc86ece3..a5511c752c 100644
--- a/share/sgml/man-refs.ent
+++ b/share/sgml/man-refs.ent
@@ -3448,7 +3448,6 @@
 <!ENTITY man.msk.4 "<citerefentry/<refentrytitle/msk/<manvolnum/4//">
 <!ENTITY man.mtio.4 "<citerefentry/<refentrytitle/mtio/<manvolnum/4//">
 <!ENTITY man.multicast.4 "<citerefentry/<refentrytitle/multicast/<manvolnum/4//">
-<!ENTITY man.msk.4 "<citerefentry/<refentrytitle/msk/<manvolnum/4//">
 <!ENTITY man.mxge.4 "<citerefentry/<refentrytitle/mxge/<manvolnum/4//">
 <!ENTITY man.my.4 "<citerefentry/<refentrytitle/my/<manvolnum/4//">
 <!ENTITY man.natm.4 "<citerefentry/<refentrytitle/natm/<manvolnum/4//">