diff --git a/RELEASENOTES.md b/RELEASENOTES.md
index 967f28bca9..498953995d 100644
--- a/RELEASENOTES.md
+++ b/RELEASENOTES.md
@@ -7,6 +7,10 @@
 *   Audio:
     *   Fix `SimpleExoPlayer` reporting audio session ID as 0 in some cases
         ([#8585](https://github.com/google/ExoPlayer/issues/8585)).
+*   IMA extension:
+    *   Fix a bug with playback of ads in playlists, where the incorrect period
+        index was used when deciding whether to trigger playback of an ad after
+        a seek.
 *   VP9 extension: Update to use NDK r22
     ([#8581](https://github.com/google/ExoPlayer/issues/8581)).
 *   FLAC extension: Update to use NDK r22
diff --git a/extensions/ima/src/main/java/com/google/android/exoplayer2/ext/ima/AdTagLoader.java b/extensions/ima/src/main/java/com/google/android/exoplayer2/ext/ima/AdTagLoader.java
index 9908e4940c..3984d586df 100644
--- a/extensions/ima/src/main/java/com/google/android/exoplayer2/ext/ima/AdTagLoader.java
+++ b/extensions/ima/src/main/java/com/google/android/exoplayer2/ext/ima/AdTagLoader.java
@@ -826,7 +826,7 @@ import java.util.Map;
       ensureSentContentCompleteIfAtEndOfStream();
       if (!sentContentComplete && !timeline.isEmpty()) {
         long positionMs = getContentPeriodPositionMs(player, timeline, period);
-        timeline.getPeriod(/* periodIndex= */ 0, period);
+        timeline.getPeriod(player.getCurrentPeriodIndex(), period);
         int newAdGroupIndex = period.getAdGroupIndexForPositionUs(C.msToUs(positionMs));
         if (newAdGroupIndex != C.INDEX_UNSET) {
           sentPendingContentPositionMs = false;