diff --git a/plyer/platforms/android/compass.py b/plyer/platforms/android/compass.py
index 9a7fa7617..7ea79e1b6 100644
--- a/plyer/platforms/android/compass.py
+++ b/plyer/platforms/android/compass.py
@@ -7,6 +7,9 @@
 from jnius import PythonJavaClass, java_method, autoclass, cast
 from plyer.platforms.android import activity
 
+Context = autoclass('android.content.Context')
+Sensor = autoclass('android.hardware.Sensor')
+SensorManager = autoclass('android.hardware.SensorManager')
 
 class MagneticFieldSensorListener(PythonJavaClass):
     __javainterfaces__ = ['android/hardware/SensorEventListener']