diff --git a/ArduCopter/Copter.h b/ArduCopter/Copter.h
index 4385641a15e..1a3c5a046ca 100644
--- a/ArduCopter/Copter.h
+++ b/ArduCopter/Copter.h
@@ -901,9 +901,9 @@ private:
     void userhook_MediumLoop();
     void userhook_SlowLoop();
     void userhook_SuperSlowLoop();
-    void userhook_auxSwitch1(uint8_t ch_flag);
-    void userhook_auxSwitch2(uint8_t ch_flag);
-    void userhook_auxSwitch3(uint8_t ch_flag);
+    void userhook_auxSwitch1(const RC_Channel::AuxSwitchPos ch_flag);
+    void userhook_auxSwitch2(const RC_Channel::AuxSwitchPos ch_flag);
+    void userhook_auxSwitch3(const RC_Channel::AuxSwitchPos ch_flag);
 
     // vehicle specific waypoint info helpers
     bool get_wp_distance_m(float &distance) const override;
diff --git a/ArduCopter/UserCode.cpp b/ArduCopter/UserCode.cpp
index 46070d47fa5..1fc9824fdc7 100644
--- a/ArduCopter/UserCode.cpp
+++ b/ArduCopter/UserCode.cpp
@@ -44,17 +44,17 @@ void Copter::userhook_SuperSlowLoop()
 #endif
 
 #ifdef USERHOOK_AUXSWITCH
-void Copter::userhook_auxSwitch1(uint8_t ch_flag)
+void Copter::userhook_auxSwitch1(const RC_Channel::AuxSwitchPos ch_flag)
 {
     // put your aux switch #1 handler here (CHx_OPT = 47)
 }
 
-void Copter::userhook_auxSwitch2(uint8_t ch_flag)
+void Copter::userhook_auxSwitch2(const RC_Channel::AuxSwitchPos ch_flag)
 {
     // put your aux switch #2 handler here (CHx_OPT = 48)
 }
 
-void Copter::userhook_auxSwitch3(uint8_t ch_flag)
+void Copter::userhook_auxSwitch3(const RC_Channel::AuxSwitchPos ch_flag)
 {
     // put your aux switch #3 handler here (CHx_OPT = 49)
 }