diff --git a/libraries/AP_Mount/examples/trivial_AP_Mount/trivial_AP_Mount.pde b/libraries/AP_Mount/examples/trivial_AP_Mount/trivial_AP_Mount.pde
index 0d1ed5c308..45cd603ccb 100644
--- a/libraries/AP_Mount/examples/trivial_AP_Mount/trivial_AP_Mount.pde
+++ b/libraries/AP_Mount/examples/trivial_AP_Mount/trivial_AP_Mount.pde
@@ -12,6 +12,7 @@
 #include <AP_Declination.h>
 #include <AP_Airspeed.h>
 #include <AP_ADC.h>
+#include <AP_ADC_AnalogSource.h>
 #include <AP_Baro.h>
 #include <AP_Buffer.h>
 #include <Filter.h>