diff --git a/RELEASENOTES.md b/RELEASENOTES.md
index 6cdf4e334e..fa7db84490 100644
--- a/RELEASENOTES.md
+++ b/RELEASENOTES.md
@@ -19,6 +19,9 @@
     *   Start early-enabled renderers only after advancing the playing period
         when transitioning between media items
         ([#1017](https://github.com/androidx/media/issues/1017)).
+    *   Add missing return type to proguard `-keepclasseswithmembers` rule for
+        `DefaultVideoFrameProcessor.Factory.Builder.build()`
+        ([#1187](https://github.com/androidx/media/issues/1187)).
 *   Transformer:
     *   Add `audioConversionProcess` and `videoConversionProcess` to
         `ExportResult` indicating how the respective track in the output file
diff --git a/libraries/exoplayer/proguard-rules.txt b/libraries/exoplayer/proguard-rules.txt
index 9e04184575..64f8ce1eba 100644
--- a/libraries/exoplayer/proguard-rules.txt
+++ b/libraries/exoplayer/proguard-rules.txt
@@ -69,5 +69,5 @@
 }
 -dontnote androidx.media3.effect.DefaultVideoFrameProcessor$Factory$Builder
 -keepclasseswithmembers class androidx.media3.effect.DefaultVideoFrameProcessor$Factory$Builder {
-  build();
+  androidx.media3.effect.DefaultVideoFrameProcessor$Factory build();
 }