diff --git a/share/man/man4/netintro.4 b/share/man/man4/netintro.4
index 506b89f4e653..97ba82b427f7 100644
--- a/share/man/man4/netintro.4
+++ b/share/man/man4/netintro.4
@@ -154,7 +154,7 @@ are known to the system
 #define    AF_ISO       18   /* ISO protocols */
 .Ed
 .Sh ROUTING
-.Tn UNIX
+.Fx
 provides some packet routing facilities.
 The kernel maintains a routing information database, which
 is used in selecting the appropriate network interface when