diff --git a/stand/kboot/hostdisk.c b/stand/kboot/hostdisk.c
index bc31bef8e6d0..628450ef8bb5 100644
--- a/stand/kboot/hostdisk.c
+++ b/stand/kboot/hostdisk.c
@@ -60,6 +60,8 @@ struct devsw hostdisk = {
  */
 #define SYSBLK "/sys/block"
 
+#define HOSTDISK_MIN_SIZE (16ul << 20)	/* 16MB */
+
 typedef STAILQ_HEAD(, hdinfo) hdinfo_list_t;
 typedef struct hdinfo {
 	STAILQ_ENTRY(hdinfo)	hd_link;	/* link in device list */
@@ -162,6 +164,8 @@ hostdisk_add_drive(const char *drv, uint64_t secs)
 	if (!file2u64(fn, &hd->hd_sectorsize))
 		goto err;
 	hd->hd_size = hd->hd_sectors * hd->hd_sectorsize;
+	if (hd->hd_size < HOSTDISK_MIN_SIZE)
+		goto err;
 	hd->hd_flags = 0;
 	STAILQ_INIT(&hd->hd_children);
 	printf("/dev/%s: %ju %ju %ju\n",