diff --git a/libraries/AP_OpticalFlow/examples/AP_OpticalFlow_test/AP_OpticalFlow_test.cpp b/libraries/AP_OpticalFlow/examples/AP_OpticalFlow_test/AP_OpticalFlow_test.cpp
index d61bdf218a..0d154ef6f8 100644
--- a/libraries/AP_OpticalFlow/examples/AP_OpticalFlow_test/AP_OpticalFlow_test.cpp
+++ b/libraries/AP_OpticalFlow/examples/AP_OpticalFlow_test/AP_OpticalFlow_test.cpp
@@ -23,7 +23,7 @@ public:
     Compass compass;
     AP_InertialSensor ins;
     AP_SerialManager serial_manager;
-    RangeFinder sonar {serial_manager};
+    RangeFinder sonar {serial_manager, ROTATION_PITCH_270};
     AP_AHRS_NavEKF ahrs{ins, barometer, gps, sonar, EKF2, EKF3,
                         AP_AHRS_NavEKF::FLAG_ALWAYS_USE_EKF};
     NavEKF2 EKF2{&ahrs, barometer, sonar};