diff --git a/ArduPlane/Plane.h b/ArduPlane/Plane.h
index 65131d2c66..7c87fc6d3a 100644
--- a/ArduPlane/Plane.h
+++ b/ArduPlane/Plane.h
@@ -170,10 +170,6 @@ private:
     AP_Baro barometer;
     Compass compass;
 
-#if CONFIG_HAL_BOARD == HAL_BOARD_APM1
-    AP_ADC_ADS7844 apm1_adc;
-#endif
-
     AP_InertialSensor ins;
 
 // Inertial Navigation EKF
diff --git a/ArduPlane/system.cpp b/ArduPlane/system.cpp
index 39eb302101..8313962f8b 100644
--- a/ArduPlane/system.cpp
+++ b/ArduPlane/system.cpp
@@ -76,6 +76,10 @@ static void failsafe_check_static()
     plane.failsafe_check();
 }
 
+#if CONFIG_HAL_BOARD == HAL_BOARD_APM1
+AP_ADC_ADS7844 apm1_adc;
+#endif
+
 void Plane::init_ardupilot()
 {
     // initialise serial port