diff --git a/libraries/AP_Math/examples/eulers/eulers.pde b/libraries/AP_Math/examples/eulers/eulers.pde
index 8fc26c7e56..cee435ac5d 100644
--- a/libraries/AP_Math/examples/eulers/eulers.pde
+++ b/libraries/AP_Math/examples/eulers/eulers.pde
@@ -35,6 +35,7 @@
 #include <AP_ADC_AnalogSource.h>
 #include <AP_Rally.h>
 #include <AP_BattMonitor.h>
+#include <AP_RangeFinder.h>
 
 const AP_HAL::HAL& hal = AP_HAL_BOARD_DRIVER;
 
diff --git a/libraries/AP_Math/examples/location/location.pde b/libraries/AP_Math/examples/location/location.pde
index dcf3854830..09c4211fd6 100644
--- a/libraries/AP_Math/examples/location/location.pde
+++ b/libraries/AP_Math/examples/location/location.pde
@@ -33,6 +33,7 @@
 #include <AP_ADC_AnalogSource.h>
 #include <AP_Compass.h>
 #include <AP_BattMonitor.h>
+#include <AP_RangeFinder.h>
 
 const AP_HAL::HAL& hal = AP_HAL_BOARD_DRIVER;
 
diff --git a/libraries/AP_Math/examples/rotations/rotations.pde b/libraries/AP_Math/examples/rotations/rotations.pde
index 45587ad169..cfd070f4c7 100644
--- a/libraries/AP_Math/examples/rotations/rotations.pde
+++ b/libraries/AP_Math/examples/rotations/rotations.pde
@@ -34,6 +34,7 @@
 #include <AP_ADC_AnalogSource.h>
 #include <AP_Rally.h>
 #include <AP_BattMonitor.h>
+#include <AP_RangeFinder.h>
 
 const AP_HAL::HAL& hal = AP_HAL_BOARD_DRIVER;