diff --git a/drivers/thunderbolt/icm.c b/drivers/thunderbolt/icm.c
index 10fefac3b1d9..669807f0eaf8 100644
--- a/drivers/thunderbolt/icm.c
+++ b/drivers/thunderbolt/icm.c
@@ -2341,7 +2341,7 @@ static int icm_usb4_switch_op(struct tb_switch *sw, u16 opcode, u32 *metadata,
 	if (tx_data_len) {
 		request.data_len_valid |= ICM_USB4_SWITCH_DATA_VALID;
 		if (tx_data_len < ARRAY_SIZE(request.data))
-			request.data_len_valid =
+			request.data_len_valid |=
 				tx_data_len & ICM_USB4_SWITCH_DATA_LEN_MASK;
 		memcpy(request.data, tx_data, tx_data_len * sizeof(u32));
 	}