diff --git a/AntennaTracker/system.cpp b/AntennaTracker/system.cpp
index 774ee6ef4f..e42836ebe0 100644
--- a/AntennaTracker/system.cpp
+++ b/AntennaTracker/system.cpp
@@ -195,8 +195,8 @@ void Tracker::disarm_servos()
 void Tracker::prepare_servos()
 {
     start_time_ms = AP_HAL::millis();
-    SRV_Channels::set_output_limit(SRV_Channel::k_tracker_yaw, SRV_Channel::SRV_CHANNEL_LIMIT_TRIM);
-    SRV_Channels::set_output_limit(SRV_Channel::k_tracker_pitch, SRV_Channel::SRV_CHANNEL_LIMIT_TRIM);
+    SRV_Channels::set_output_limit(SRV_Channel::k_tracker_yaw, SRV_Channel::Limit::TRIM);
+    SRV_Channels::set_output_limit(SRV_Channel::k_tracker_pitch, SRV_Channel::Limit::TRIM);
     SRV_Channels::calc_pwm();
     SRV_Channels::output_ch_all();
 }