diff --git a/usr.sbin/makefs/ffs/Makefile.inc b/usr.sbin/makefs/ffs/Makefile.inc
index a1e839fd7ab6..cff2c30b67c5 100644
--- a/usr.sbin/makefs/ffs/Makefile.inc
+++ b/usr.sbin/makefs/ffs/Makefile.inc
@@ -1,9 +1,11 @@
 #	$FreeBSD$
 #
 
 .PATH:	${SRCDIR}/ffs ${SRCTOP}/sys/ufs/ffs
 SRCS+=	ffs_alloc.c ffs_balloc.c ffs_bswap.c ffs_subr.c ufs_bmap.c
 SRCS+=	buf.c mkfs.c
 
 # Reach-over source from sys/ufs/ffs
 SRCS+=	ffs_tables.c
+
+CWARNFLAGS.ffs_balloc.c+= -Wno-sign-compare
diff --git a/usr.sbin/makefs/zfs/Makefile.inc b/usr.sbin/makefs/zfs/Makefile.inc
index bebe8c322035..78561813e229 100644
--- a/usr.sbin/makefs/zfs/Makefile.inc
+++ b/usr.sbin/makefs/zfs/Makefile.inc
@@ -1,12 +1,13 @@
 .PATH:	${SRCDIR}/zfs
 .PATH:	${SRCTOP}/stand/libsa/zfs
 
 SRCS+=	dsl.c \
 	fs.c \
 	objset.c \
 	vdev.c \
 	zap.c
 
 SRCS+=	nvlist.c
 
 CFLAGS.nvlist.c+= -I${SRCTOP}/stand/libsa -Wno-cast-qual
+CWARNFLAGS.zap.c+= -Wno-sign-compare