diff --git a/ArduCopter/Log.cpp b/ArduCopter/Log.cpp
index 9115c3a79b..2a5196c367 100644
--- a/ArduCopter/Log.cpp
+++ b/ArduCopter/Log.cpp
@@ -425,6 +425,7 @@ struct PACKED log_MotBatt {
 // Write an rate packet
 void Copter::Log_Write_MotBatt()
 {
+#if FRAME_CONFIG != HELI_FRAME
     struct log_MotBatt pkt_mot = {
         LOG_PACKET_HEADER_INIT(LOG_MOTBATT_MSG),
         time_us         : hal.scheduler->micros64(),
@@ -434,6 +435,7 @@ void Copter::Log_Write_MotBatt()
         th_limit        : (float)(motors.get_throttle_limit())
     };
     DataFlash.WriteBlock(&pkt_mot, sizeof(pkt_mot));
+#endif
 }
 
 struct PACKED log_Startup {