diff --git a/drivers/cxl/core/memdev.c b/drivers/cxl/core/memdev.c
index 33a3d2e7b13a..45e7d2be17e0 100644
--- a/drivers/cxl/core/memdev.c
+++ b/drivers/cxl/core/memdev.c
@@ -921,7 +921,7 @@ static enum fw_upload_err cxl_fw_prepare(struct fw_upload *fwl, const u8 *data,
 	if (!size)
 		return FW_UPLOAD_ERR_INVALID_SIZE;
 
-	mds->fw.oneshot = struct_size(transfer, data, size) <
+	mds->fw.oneshot = struct_size(transfer, data, size) <=
 			    cxl_mbox->payload_size;
 
 	if (cxl_mem_get_fw_info(mds))