diff --git a/radio/src/telemetry/telemetry.h b/radio/src/telemetry/telemetry.h
index 99513f543..78d801b32 100644
--- a/radio/src/telemetry/telemetry.h
+++ b/radio/src/telemetry/telemetry.h
@@ -217,6 +217,7 @@ class OutputTelemetryBuffer {
 
     void pushSportPacketWithBytestuffing(SportTelemetryPacket & packet)
     {
+      size = 0;
       uint16_t crc = 0;
       sport.physicalId = packet.physicalId; // no bytestuffing, no CRC
       for (uint8_t i=1; i<sizeof(SportTelemetryPacket); i++) {