diff --git a/module/zfs/vdev_mirror.c b/module/zfs/vdev_mirror.c
index f360a18c00..106678a870 100644
--- a/module/zfs/vdev_mirror.c
+++ b/module/zfs/vdev_mirror.c
@@ -649,6 +649,15 @@ vdev_mirror_io_start(zio_t *zio)
 			 */
 			for (c = 0; c < mm->mm_children; c++) {
 				mc = &mm->mm_child[c];
+
+				/* Don't issue ZIOs to offline children */
+				if (!vdev_mirror_child_readable(mc)) {
+					mc->mc_error = SET_ERROR(ENXIO);
+					mc->mc_tried = 1;
+					mc->mc_skipped = 1;
+					continue;
+				}
+
 				zio_nowait(zio_vdev_child_io(zio, zio->io_bp,
 				    mc->mc_vd, mc->mc_offset,
 				    abd_alloc_sametype(zio->io_abd,