diff --git a/opendbc/safety/modes/toyota.h b/opendbc/safety/modes/toyota.h
index 3e0a8b7c05f..0d94d2ecc54 100644
--- a/opendbc/safety/modes/toyota.h
+++ b/opendbc/safety/modes/toyota.h
@@ -331,7 +331,7 @@ static bool toyota_tx_hook(const CANPacket_t *msg) {
     // this address is sub-addressed. only allow tester present to radar (0xF)
     bool invalid_uds_msg = (GET_BYTES(msg, 0, 4) != 0x003E020FU) || (GET_BYTES(msg, 4, 4) != 0x0U);
     if (invalid_uds_msg) {
-      tx = 0;
+      tx = false;
     }
   }