diff --git a/cores/esp32/Udp.h b/cores/esp32/Udp.h
index f47f83cc..fd79975e 100644
--- a/cores/esp32/Udp.h
+++ b/cores/esp32/Udp.h
@@ -43,6 +43,7 @@ class UDP: public Stream
 
 public:
     virtual uint8_t begin(uint16_t) =0;	// initialize, start listening on specified port. Returns 1 if successful, 0 if there are no sockets available to use
+    virtual uint8_t beginMulticast(IPAddress, uint16_t) { return 0; }  // initialize, start listening on specified multicast IP address and port. Returns 1 if successful, 0 on failure
     virtual void stop() =0;  // Finish with the UDP socket
 
     // Sending UDP packets