diff --git a/drivers/tee/optee/rpmb.c b/drivers/tee/optee/rpmb.c
index 955155b..cf1ce77 100644
--- a/drivers/tee/optee/rpmb.c
+++ b/drivers/tee/optee/rpmb.c
@@ -98,6 +98,7 @@
 static u32 rpmb_get_dev_info(u16 dev_id, struct rpmb_dev_info *info)
 {
 	struct mmc *mmc = find_mmc_device(dev_id);
+	int i;
 
 	if (!mmc)
 		return TEE_ERROR_ITEM_NOT_FOUND;
@@ -105,7 +106,9 @@
 	if (!mmc->ext_csd)
 		return TEE_ERROR_GENERIC;
 
-	memcpy(info->cid, mmc->cid, sizeof(info->cid));
+	for (i = 0; i < ARRAY_SIZE(mmc->cid); i++)
+		((u32 *) info->cid)[i] = cpu_to_be32(mmc->cid[i]);
+
 	info->rel_wr_sec_c = mmc->ext_csd[222];
 	info->rpmb_size_mult = mmc->ext_csd[168];
 	info->ret_code = RPMB_CMD_GET_DEV_INFO_RET_OK;