diff --git a/drivers/firmware/arm_scmi/optee.c b/drivers/firmware/arm_scmi/optee.c
index 8abace56b95885da4ccb9d52488083996c234e9e..f42dad997ac9a50a947191f55d19a05a1c3d08ba 100644
--- a/drivers/firmware/arm_scmi/optee.c
+++ b/drivers/firmware/arm_scmi/optee.c
@@ -106,6 +106,7 @@ enum scmi_optee_pta_cmd {
  * @channel_id: OP-TEE channel ID used for this transport
  * @tee_session: TEE session identifier
  * @caps: OP-TEE SCMI channel capabilities
+ * @rx_len: Response size
  * @mu: Mutex protection on channel access
  * @cinfo: SCMI channel information
  * @shmem: Virtual base address of the shared memory