diff --git a/lib/nvmf/transport.c b/lib/nvmf/transport.c
index 8535d8389..7c8e193fa 100644
--- a/lib/nvmf/transport.c
+++ b/lib/nvmf/transport.c
@@ -122,7 +122,7 @@ spdk_nvmf_transport_create(enum spdk_nvme_transport_type type,
 
 	transport->data_buf_pool = spdk_mempool_create(spdk_mempool_name,
 				   opts->num_shared_buffers,
-				   opts->max_io_size + NVMF_DATA_BUFFER_ALIGNMENT,
+				   opts->io_unit_size + NVMF_DATA_BUFFER_ALIGNMENT,
 				   SPDK_MEMPOOL_DEFAULT_CACHE_SIZE,
 				   SPDK_ENV_SOCKET_ID_ANY);