diff --git a/platformio.ini b/platformio.ini
index 15e2e67..9bceb1f 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -53,6 +53,7 @@ build_flags =
 			-D 'FIX_BEACON_INTERVAL=1800000L'	; can be set from www interfeace
 			-D 'NETWORK_GPS_PORT=10110'			; GPS NMEA Port
 			-D 'ENABLE_TNC_SELF_TELEMETRY'		; send telemetry data about device
+			-D 'TNC_SELF_TELEMETRY_INTERVAL=1800000L' ; telemetry interval
 
 [env:ttgo-t-beam-v1.0]
 platform = espressif32 @ 3.0.0