diff --git a/cores/arduino/HardwareSerial.cpp b/cores/arduino/HardwareSerial.cpp
index 20d2a99377..3aba60253d 100644
--- a/cores/arduino/HardwareSerial.cpp
+++ b/cores/arduino/HardwareSerial.cpp
@@ -265,11 +265,22 @@ HardwareSerial::HardwareSerial(void *peripheral, HalfDuplexMode_t halfDuplex)
setTx(PIN_SERIALLP2_TX);
} else
#endif
- // else get the pins of the first peripheral occurrence in PinMap
- {
- _serial.pin_rx = pinmap_pin(peripheral, PinMap_UART_RX);
- _serial.pin_tx = pinmap_pin(peripheral, PinMap_UART_TX);
- }
+#if defined(PIN_SERIAL_TX)
+ // If PIN_SERIAL_TX is defined but Serial is mapped on other peripheral
+ // (usually SerialUSB) use the pins defined for specified peripheral
+ // instead of the first one found
+ if ((pinmap_peripheral(digitalPinToPinName(PIN_SERIAL_TX), PinMap_UART_TX) == peripheral)) {
+#if defined(PIN_SERIAL_RX)
+ setRx(PIN_SERIAL_RX);
+#endif
+ setTx(PIN_SERIAL_TX);
+ } else
+#endif
+ {
+ // else get the pins of the first peripheral occurrence in PinMap
+ _serial.pin_rx = pinmap_pin(peripheral, PinMap_UART_RX);
+ _serial.pin_tx = pinmap_pin(peripheral, PinMap_UART_TX);
+ }
if (halfDuplex == HALF_DUPLEX_ENABLED) {
_serial.pin_rx = NC;
}
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