diff --git a/include/spdk/bdev.h b/include/spdk/bdev.h
index f6c4063c8..4bdbce5f6 100644
--- a/include/spdk/bdev.h
+++ b/include/spdk/bdev.h
@@ -97,6 +97,7 @@ enum spdk_bdev_io_type {
 	SPDK_BDEV_IO_TYPE_NVME_IO,
 	SPDK_BDEV_IO_TYPE_NVME_IO_MD,
 	SPDK_BDEV_IO_TYPE_WRITE_ZEROES,
+	SPDK_BDEV_NUM_IO_TYPES /* Keep last */
 };
 
 /**