diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index a2e45ed6ef143a..8aaed87193948b 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -278,7 +278,9 @@ blk_status_t btree_csum_one_bio(struct btrfs_bio *bbio)
 	 * ordering of I/O without unnecessarily writing out data.
 	 */
 	if (test_bit(EXTENT_BUFFER_ZONED_ZEROOUT, &eb->bflags)) {
-		memzero_extent_buffer(eb, 0, eb->len);
+		const unsigned long header_size = sizeof(struct btrfs_header);
+
+		memzero_extent_buffer(eb, header_size, eb->len - header_size);
 		return BLK_STS_OK;
 	}