diff --git a/extensions/vp9/src/main/java/com/google/android/exoplayer2/ext/vp9/LibvpxVideoRenderer.java b/extensions/vp9/src/main/java/com/google/android/exoplayer2/ext/vp9/LibvpxVideoRenderer.java
index 696221cae8..4c20cd7a82 100644
--- a/extensions/vp9/src/main/java/com/google/android/exoplayer2/ext/vp9/LibvpxVideoRenderer.java
+++ b/extensions/vp9/src/main/java/com/google/android/exoplayer2/ext/vp9/LibvpxVideoRenderer.java
@@ -239,6 +239,7 @@ public class LibvpxVideoRenderer extends SimpleDecoderVideoRenderer {
   }
 
   @Override
+  @Nullable
   protected VideoDecoderOutputBuffer dequeueOutputBuffer() throws VpxDecoderException {
     outputBuffer = decoder.dequeueOutputBuffer();
     return outputBuffer;