diff --git a/library/transformer/build.gradle b/library/transformer/build.gradle
index a06a70a320..a89617a0b4 100644
--- a/library/transformer/build.gradle
+++ b/library/transformer/build.gradle
@@ -38,6 +38,7 @@ android {
 dependencies {
     implementation 'androidx.annotation:annotation:' + androidxAnnotationVersion
     implementation project(modulePrefix + 'library-core')
+    compileOnly 'com.google.errorprone:error_prone_annotations:' + errorProneVersion
     compileOnly 'org.checkerframework:checker-qual:' + checkerframeworkVersion
     compileOnly 'org.checkerframework:checker-compat-qual:' + checkerframeworkCompatVersion
     compileOnly 'org.jetbrains.kotlin:kotlin-annotations-jvm:' + kotlinAnnotationsVersion
diff --git a/library/transformer/src/main/java/com/google/android/exoplayer2/transformer/TransformerBaseRenderer.java b/library/transformer/src/main/java/com/google/android/exoplayer2/transformer/TransformerBaseRenderer.java
index bf064520b2..4b78c64b8b 100644
--- a/library/transformer/src/main/java/com/google/android/exoplayer2/transformer/TransformerBaseRenderer.java
+++ b/library/transformer/src/main/java/com/google/android/exoplayer2/transformer/TransformerBaseRenderer.java
@@ -29,6 +29,7 @@ import com.google.android.exoplayer2.decoder.DecoderInputBuffer;
 import com.google.android.exoplayer2.source.SampleStream.ReadDataResult;
 import com.google.android.exoplayer2.util.MediaClock;
 import com.google.android.exoplayer2.util.MimeTypes;
+import com.google.errorprone.annotations.ForOverride;
 import org.checkerframework.checker.nullness.qual.EnsuresNonNullIf;
 import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
 import org.checkerframework.checker.nullness.qual.RequiresNonNull;
@@ -133,6 +134,7 @@ import org.checkerframework.checker.nullness.qual.RequiresNonNull;
     muxerWrapperTrackEnded = false;
   }
 
+  @ForOverride
   @EnsuresNonNullIf(expression = "samplePipeline", result = true)
   protected abstract boolean ensureConfigured() throws ExoPlaybackException;