diff --git a/libraries/AP_Beacon/examples/AP_Marvelmind_test/AP_Marvelmind_test.cpp b/libraries/AP_Beacon/examples/AP_Marvelmind_test/AP_Marvelmind_test.cpp
index eca4337a7f..051a7f756a 100644
--- a/libraries/AP_Beacon/examples/AP_Marvelmind_test/AP_Marvelmind_test.cpp
+++ b/libraries/AP_Beacon/examples/AP_Marvelmind_test/AP_Marvelmind_test.cpp
@@ -11,13 +11,16 @@
 
 void setup();
 void loop();
+void set_object_value_and_report(const void *object_pointer,
+                      const struct AP_Param::GroupInfo *group_info,
+                      const char *name, float value);
 
 const AP_HAL::HAL& hal = AP_HAL::get_HAL();
 static AP_SerialManager serial_manager;
 AP_Beacon beacon{serial_manager};
 
 // try to set the object value but provide diagnostic if it failed
-void set_object_value(const void *object_pointer,
+void set_object_value_and_report(const void *object_pointer,
                       const struct AP_Param::GroupInfo *group_info,
                       const char *name, float value)
 {
@@ -29,8 +32,8 @@ void set_object_value(const void *object_pointer,
 
 void setup(void)
 {
-    set_object_value(&beacon, beacon.var_info, "_TYPE", 2.0f);
-    set_object_value(&serial_manager, serial_manager.var_info, "0_PROTOCOL", 13.0f);
+    set_object_value_and_report(&beacon, beacon.var_info, "_TYPE", 2.0f);
+    set_object_value_and_report(&serial_manager, serial_manager.var_info, "0_PROTOCOL", 13.0f);
     serial_manager.init();
     beacon.init();
 }
@@ -43,7 +46,7 @@ void loop(void)
     float accuracy = 0.0f;
     beacon.get_vehicle_position_ned(pos, accuracy);
     if (pos.x > 0.001f) {
-        printf("%f %f %f\n", pos.x, pos.y, pos.z);
+        printf("%f %f %f\n", static_cast<double>(pos.x), static_cast<double>(pos.y), static_cast<double>(pos.z));
         count++;
     }
     hal.scheduler->delay(1000);