diff --git a/src/xrt/drivers/android/android_prober.h b/src/xrt/drivers/android/android_prober.h
index 5b8e60429..feb64548f 100644
--- a/src/xrt/drivers/android/android_prober.h
+++ b/src/xrt/drivers/android/android_prober.h
@@ -26,7 +26,7 @@ extern "C" {
  * @ingroup drv_android
  */
 struct xrt_auto_prober *
-android_create_auto_prober();
+android_create_auto_prober(void);
 
 
 /*!
diff --git a/src/xrt/drivers/android/android_sensors.h b/src/xrt/drivers/android/android_sensors.h
index b792b1b04..d99b8e9cb 100644
--- a/src/xrt/drivers/android/android_sensors.h
+++ b/src/xrt/drivers/android/android_sensors.h
@@ -53,7 +53,7 @@ struct android_device
 
 
 struct android_device *
-android_device_create();
+android_device_create(void);
 
 
 /*