diff --git a/src/stm32/can.c b/src/stm32/can.c
index 30f8fc906..223260b36 100644
--- a/src/stm32/can.c
+++ b/src/stm32/can.c
@@ -127,7 +127,7 @@ canhw_send(struct canbus_msg *msg)
     else
         tir = (msg->id & 0x7ff) << CAN_TI0R_STID_Pos;
     tir |= msg->id & CANMSG_ID_RTR ? CAN_TI0R_RTR : 0;
-    mb->TIR = (msg->id << CAN_TI0R_STID_Pos) | CAN_TI0R_TXRQ;
+    mb->TIR = tir | CAN_TI0R_TXRQ;
     return CANMSG_DATA_LEN(msg);
 }