diff --git a/drivers/md/dm-integrity.c b/drivers/md/dm-integrity.c
index 0370d7d7ce72..d4fe85d61d33 100644
--- a/drivers/md/dm-integrity.c
+++ b/drivers/md/dm-integrity.c
@@ -1980,7 +1980,7 @@ static void integrity_metadata(struct work_struct *w)
 		if (unlikely(dio->op == REQ_OP_DISCARD)) {
 			unsigned int bi_size = dio->bio_details.bi_iter.bi_size;
 			unsigned int max_size = likely(checksums != checksums_onstack) ? PAGE_SIZE : HASH_MAX_DIGESTSIZE;
-			unsigned int max_blocks = max_size / ic->tag_size;
+			unsigned int max_blocks = (max_size - extra_space) / ic->tag_size;
 			sector_t sector = dio->range.logical_sector;
 
 			if (!ic->discard_keyed)