diff --git a/variants/nrf52840/rak4631/platformio.ini b/variants/nrf52840/rak4631/platformio.ini
index 199e17570..8578b5e81 100644
--- a/variants/nrf52840/rak4631/platformio.ini
+++ b/variants/nrf52840/rak4631/platformio.ini
@@ -8,6 +8,7 @@ build_flags = ${nrf52840_base.build_flags}
   -I variants/nrf52840/rak4631
   -D RAK_4631
   -DGPS_POWER_TOGGLE ; comment this line to disable triple press function on the user button to turn off gps entirely.
+  -DHAS_UDP_MULTICAST=1
   -DEINK_DISPLAY_MODEL=GxEPD2_213_BN
   -DEINK_WIDTH=250
   -DEINK_HEIGHT=122