diff --git a/module/zfs/dmu.c b/module/zfs/dmu.c
index 97379dfc1c..8a13b8f410 100644
--- a/module/zfs/dmu.c
+++ b/module/zfs/dmu.c
@@ -2279,6 +2279,7 @@ dmu_brt_clone(objset_t *os, uint64_t object, uint64_t offset, uint64_t length,
 
 		ASSERT0(db->db_level);
 		ASSERT(db->db_blkid != DMU_BONUS_BLKID);
+		ASSERT(db->db_blkid != DMU_SPILL_BLKID);
 
 		if (!BP_IS_HOLE(bp) && BP_GET_LSIZE(bp) != dbuf->db_size) {
 			error = SET_ERROR(EXDEV);
@@ -2293,6 +2294,7 @@ dmu_brt_clone(objset_t *os, uint64_t object, uint64_t offset, uint64_t length,
 
 		ASSERT0(db->db_level);
 		ASSERT(db->db_blkid != DMU_BONUS_BLKID);
+		ASSERT(db->db_blkid != DMU_SPILL_BLKID);
 		ASSERT(BP_IS_HOLE(bp) || dbuf->db_size == BP_GET_LSIZE(bp));
 
 		dmu_buf_will_clone(dbuf, tx);