diff --git a/gnu/usr.bin/groff/tmac/mdoc.local b/gnu/usr.bin/groff/tmac/mdoc.local
index bbab7047825..4d56befd9d7 100644
--- a/gnu/usr.bin/groff/tmac/mdoc.local
+++ b/gnu/usr.bin/groff/tmac/mdoc.local
@@ -58,6 +58,7 @@
 .ds doc-operating-system-FreeBSD-8.4    8.4
 .ds doc-operating-system-FreeBSD-9.1    9.1
 .ds doc-operating-system-FreeBSD-9.2    9.2
+.ds doc-operating-system-FreeBSD-9.3    9.3
 .ds doc-operating-system-FreeBSD-10.0   10.0
 .ds doc-operating-system-FreeBSD-10.1   10.1
 .ds doc-operating-system-FreeBSD-11.0   11.0