diff --git a/libraries/AP_IOMCU/AP_IOMCU.cpp b/libraries/AP_IOMCU/AP_IOMCU.cpp
index fd8015dee2..8cfca628e3 100644
--- a/libraries/AP_IOMCU/AP_IOMCU.cpp
+++ b/libraries/AP_IOMCU/AP_IOMCU.cpp
@@ -958,7 +958,7 @@ bool AP_IOMCU::setup_mixing(RCMapper *rcmap, int8_t override_chan,
         MIX_UPDATE(mixing.rc_reversed[i], c->get_reverse());
 
         // cope with reversible throttle
-        if (i == 2 && c->get_type() == RC_Channel::RC_CHANNEL_TYPE_ANGLE) {
+        if (i == 2 && c->get_type() == RC_Channel::ControlType::ANGLE) {
             MIX_UPDATE(mixing.throttle_is_angle, 1);
         } else {
             MIX_UPDATE(mixing.throttle_is_angle, 0);