diff --git a/cores/esp32/HardwareSerial.cpp b/cores/esp32/HardwareSerial.cpp
index be80ca27d1d..b650fe38435 100644
--- a/cores/esp32/HardwareSerial.cpp
+++ b/cores/esp32/HardwareSerial.cpp
@@ -158,6 +158,13 @@ void HardwareSerial::flush(bool txOnly)
 {
     uartFlushTxOnly(_uart, txOnly);
 }
+void serialEventRun(void)
+{
+  if (Serial1.available()) serialEvent1();
+  if (Serial2.available()) serialEvent2();
+}
+void serialEvent1() { }
+void serialEvent2() { }
 
 size_t HardwareSerial::write(uint8_t c)
 {
diff --git a/cores/esp32/HardwareSerial.h b/cores/esp32/HardwareSerial.h
index 820476748da..530f78f107e 100644
--- a/cores/esp32/HardwareSerial.h
+++ b/cores/esp32/HardwareSerial.h
@@ -106,7 +106,9 @@ class HardwareSerial: public Stream
     uart_t* _uart;
 };
 
-extern void serialEventRun(void) __attribute__((weak));
+void serialEventRun(void) __attribute__((weak));
+extern void serialEvent1() __attribute__((weak));
+extern void serialEvent2() __attribute__((weak));
 
 #if !defined(NO_GLOBAL_INSTANCES) && !defined(NO_GLOBAL_SERIAL)
 extern HardwareSerial Serial;