diff --git a/etc/mtree/BSD.include.dist b/etc/mtree/BSD.include.dist
index ce37d803c2a9..81ea0842035c 100644
--- a/etc/mtree/BSD.include.dist
+++ b/etc/mtree/BSD.include.dist
@@ -235,6 +235,8 @@
             mpilib
             ..
         ..
+        ntsync
+        ..
         nvme
         ..
         nvmf
diff --git a/include/Makefile b/include/Makefile
index 777529e344f2..3d83556f5238 100644
--- a/include/Makefile
+++ b/include/Makefile
@@ -51,7 +51,7 @@ LDIRS=	geom net net80211 netgraph netinet netinet6 \
 
 LSUBDIRS=	dev/acpica dev/agp dev/ciss dev/filemon dev/firewire \
 	dev/hwpmc dev/hyperv \
-	dev/ic dev/iicbus dev/io dev/mfi dev/mmc \
+	dev/ic dev/iicbus dev/io dev/mfi dev/mmc dev/ntsync \
 	dev/ofw dev/pbio dev/pci ${_dev_powermac_nvram} dev/ppbus dev/pwm \
 	dev/smbus dev/speaker dev/tcp_log dev/veriexec dev/vkbd dev/wg \
 	fs/devfs fs/fdescfs fs/msdosfs fs/nfs fs/nullfs \