diff --git a/sensors/ex2_boxes/ex2_boxes.pde b/sensors/ex2_boxes/ex2_boxes.pde
index b2a5cd2..e1db644 100644
--- a/sensors/ex2_boxes/ex2_boxes.pde
+++ b/sensors/ex2_boxes/ex2_boxes.pde
@@ -30,7 +30,7 @@ void setup() {
   fullScreen(P2D);
   orientation(PORTRAIT);
   
-  context = getActivity();
+  context = getContext();
   manager = (SensorManager)context.getSystemService(Context.SENSOR_SERVICE);
   sensor = manager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
   listener = new AccelerometerListener();
@@ -95,4 +95,4 @@ class AccelerometerListener implements SensorEventListener {
   }
   public void onAccuracyChanged(Sensor sensor, int accuracy) {
   }
-}
\ No newline at end of file
+}