diff --git a/sys/kern/syscalls.master b/sys/kern/syscalls.master
--- a/sys/kern/syscalls.master
+++ b/sys/kern/syscalls.master
@@ -34,6 +34,7 @@
 ;	COMPAT10 included on COMPAT_FREEBSD10 #ifdef (FreeBSD 10 compat)
 ;	COMPAT11 included on COMPAT_FREEBSD11 #ifdef (FreeBSD 11 compat)
 ;	COMPAT12 included on COMPAT_FREEBSD12 #ifdef (FreeBSD 12 compat)
+;	COMPAT13 included on COMPAT_FREEBSD13 #ifdef (FreeBSD 13 compat)
 ;	OBSOL	obsolete, not included in system, only specifies name
 ;	RESERVED reserved for local or vendor use (not for FreeBSD)
 ;	UNIMPL	not implemented, placeholder only
diff --git a/sys/tools/makesyscalls.lua b/sys/tools/makesyscalls.lua
--- a/sys/tools/makesyscalls.lua
+++ b/sys/tools/makesyscalls.lua
@@ -226,6 +226,7 @@
 	{ stdcompat = "FREEBSD10" },
 	{ stdcompat = "FREEBSD11" },
 	{ stdcompat = "FREEBSD12" },
+	{ stdcompat = "FREEBSD13" },
 }
 
 local function trim(s, char)