# Update the ProGuard rule file

> How to build your application with ProGuard.

If you are building your Android application with ProGuard, then you must add the following code to the ProGuard rule file to prevent classes from being stripped out of the build:

```plaintext
public class com.vivox.sdk.jni.androidsdkJNI
```

For more information on how to shrink your app, refer to the [Android developer documentation](https://developer.android.com/topic/performance/reduce-apk-size).