diff --git a/man3/strtoul.3 b/man3/strtoul.3
index 4c24dec3a..070a18e87 100644
--- a/man3/strtoul.3
+++ b/man3/strtoul.3
@@ -223,6 +223,7 @@ See the example on the
 manual page;
 the use of the functions described in this manual page is similar.
 .SH SEE ALSO
+.BR a64l (3),
 .BR atof (3),
 .BR atoi (3),
 .BR atol (3),