diff --git a/libraries/AP_InertialNav/examples/AP_InertialNav_test/AP_InertialNav_test.pde b/libraries/AP_InertialNav/examples/AP_InertialNav_test/AP_InertialNav_test.pde
index 430b40f397..c2e7b20a00 100644
--- a/libraries/AP_InertialNav/examples/AP_InertialNav_test/AP_InertialNav_test.pde
+++ b/libraries/AP_InertialNav/examples/AP_InertialNav_test/AP_InertialNav_test.pde
@@ -9,6 +9,7 @@
 
 #include <AP_GPS.h>             // ArduPilot GPS library
 #include <AP_ADC.h>             // ArduPilot Mega Analog to Digital Converter Library
+#include <AP_ADC_AnalogSource.h>
 #include <AP_Baro.h>            // ArduPilot Mega Barometer Library
 #include <Filter.h>
 #include <AP_Compass.h>         // ArduPilot Mega Magnetometer Library