diff --git a/share/sgml/man-refs.ent b/share/sgml/man-refs.ent
index ffdccdae88..426a95478d 100644
--- a/share/sgml/man-refs.ent
+++ b/share/sgml/man-refs.ent
@@ -1691,6 +1691,7 @@
 <!ENTITY man.floor.3 "<citerefentry/<refentrytitle/floor/<manvolnum/3//">
 <!ENTITY man.floorf.3 "<citerefentry/<refentrytitle/floorf/<manvolnum/3//">
 <!ENTITY man.floorl.3 "<citerefentry/<refentrytitle/floorl/<manvolnum/3//">
+<!ENTITY man.flopen.3 "<citerefentry/<refentrytitle/flopen/<manvolnum/3//">
 <!ENTITY man.flushinp.3 "<citerefentry/<refentrytitle/flushinp/<manvolnum/3//">
 <!ENTITY man.fma.3 "<citerefentry/<refentrytitle/fma/<manvolnum/3//">
 <!ENTITY man.fmaf.3 "<citerefentry/<refentrytitle/fmaf/<manvolnum/3//">