diff --git a/library/core/src/main/java/com/google/android/exoplayer2/audio/DefaultAudioSink.java b/library/core/src/main/java/com/google/android/exoplayer2/audio/DefaultAudioSink.java
index b098fa4d4d5..aaf7dcbaffb 100644
--- a/library/core/src/main/java/com/google/android/exoplayer2/audio/DefaultAudioSink.java
+++ b/library/core/src/main/java/com/google/android/exoplayer2/audio/DefaultAudioSink.java
@@ -225,7 +225,7 @@ public long getSkippedOutputFrameCount() {
   }
 
   /** Provides the buffer size to use when creating an {@link AudioTrack}. */
-  interface AudioTrackBufferSizeProvider {
+  public interface AudioTrackBufferSizeProvider {
     /** Default instance. */
     AudioTrackBufferSizeProvider DEFAULT =
         new DefaultAudioTrackBufferSizeProvider.Builder().build();