diff --git a/sys/fs/ext2fs/ext2_lookup.c b/sys/fs/ext2fs/ext2_lookup.c
index bdb033a8d20..cf6b6ff989b 100644
--- a/sys/fs/ext2fs/ext2_lookup.c
+++ b/sys/fs/ext2fs/ext2_lookup.c
@@ -153,7 +153,10 @@ ext2_readdir(struct vop_readdir_args *ap)
 		return (EINVAL);
 	ip = VTOI(vp);
 	if (ap->a_ncookies != NULL) {
-		ncookies = uio->uio_resid;
+		if (uio->uio_resid < 0)
+			ncookies = 0;
+		else
+			ncookies = uio->uio_resid;
 		if (uio->uio_offset >= ip->i_size)
 			ncookies = 0;
 		else if (ip->i_size - uio->uio_offset < ncookies)
diff --git a/sys/ufs/ufs/ufs_vnops.c b/sys/ufs/ufs/ufs_vnops.c
index 479091a9182..66651e3f71b 100644
--- a/sys/ufs/ufs/ufs_vnops.c
+++ b/sys/ufs/ufs/ufs_vnops.c
@@ -2179,7 +2179,10 @@ ufs_readdir(ap)
 	if (ip->i_effnlink == 0)
 		return (0);
 	if (ap->a_ncookies != NULL) {
-		ncookies = uio->uio_resid;
+		if (uio->uio_resid < 0)
+			ncookies = 0;
+		else
+			ncookies = uio->uio_resid;
 		if (uio->uio_offset >= ip->i_size)
 			ncookies = 0;
 		else if (ip->i_size - uio->uio_offset < ncookies)