diff --git a/etc/mtree/BSD.include.dist b/etc/mtree/BSD.include.dist
index 53fef5e6181..59dfc8ad6d8 100644
--- a/etc/mtree/BSD.include.dist
+++ b/etc/mtree/BSD.include.dist
@@ -33,6 +33,8 @@
     ..
     netinet
     ..
+    netinet6
+    ..
     netipx
     ..
     netkey
diff --git a/include/Makefile b/include/Makefile
index 11e5b552a35..90f691644f1 100644
--- a/include/Makefile
+++ b/include/Makefile
@@ -41,8 +41,8 @@ SFILES=	soundcard.h
 LFILES=	aio.h errno.h fcntl.h inttypes.h linker_set.h poll.h syslog.h \
 	termios.h ucontext.h
 
-LDIRS=	cam msdosfs net netatalk netatm netgraph netinet netipx netkey \
-	netncp netns nfs nwfs pccard posix4 sys vm
+LDIRS=	cam msdosfs net netatalk netatm netgraph netinet netinet6 \
+	netipx netkey netncp netns nfs nwfs pccard posix4 sys vm
 
 LNOHEADERDIRS=	isofs ufs
 LSUBDIRS=	isofs/cd9660 ufs/ffs ufs/mfs ufs/ufs cam/scsi