diff --git a/module/zfs/mmp.c b/module/zfs/mmp.c
index e50e35665e29..4d3c7401e4c2 100644
--- a/module/zfs/mmp.c
+++ b/module/zfs/mmp.c
@@ -327,7 +327,7 @@ mmp_delay_update(spa_t *spa, boolean_t write_completed)
 	 */
 	if (delay < mts->mmp_delay) {
 		hrtime_t min_delay = MSEC2NSEC(zfs_multihost_interval) /
-		    vdev_count_leaves(spa);
+		    MAX(1, vdev_count_leaves(spa));
 		mts->mmp_delay = MAX(((delay + mts->mmp_delay * 127) / 128),
 		    min_delay);
 	}