diff --git a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c
index 07fcb510061..e44c04391f5 100644
--- a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c
+++ b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c
@@ -6509,7 +6509,8 @@ l2arc_compress_buf(arc_buf_hdr_t *hdr)
 	csize = zio_compress_data(ZIO_COMPRESS_LZ4, hdr->b_l1hdr.b_tmp_cdata,
 	    cdata, l2hdr->b_asize);
 
-	rounded = P2ROUNDUP(csize, (size_t)SPA_MINBLOCKSIZE);
+	rounded = P2ROUNDUP(csize,
+	    (size_t)1 << l2hdr->b_dev->l2ad_vdev->vdev_ashift);
 	if (rounded > csize) {
 		bzero((char *)cdata + csize, rounded - csize);
 		csize = rounded;