diff --git a/arch/efi/efi/efi-block-io.c b/arch/efi/efi/efi-block-io.c
index 0011531..85603d9 100644
--- a/arch/efi/efi/efi-block-io.c
+++ b/arch/efi/efi/efi-block-io.c
@@ -149,7 +149,7 @@
 
 	priv->blk.cdev.name = asprintf("disk%d", cdev_find_free_index("disk"));
 	priv->blk.blockbits = ffs(media->block_size) - 1;
-	priv->blk.num_blocks = media->last_block;
+	priv->blk.num_blocks = media->last_block + 1;
 	priv->blk.ops = &efi_bio_ops;
 	priv->blk.dev = &efidev->dev;