diff --git a/library/core/src/main/java/com/google/android/exoplayer2/source/ads/ServerSideAdInsertionMediaSource.java b/library/core/src/main/java/com/google/android/exoplayer2/source/ads/ServerSideAdInsertionMediaSource.java
index cc9118c71f..436b57dce0 100644
--- a/library/core/src/main/java/com/google/android/exoplayer2/source/ads/ServerSideAdInsertionMediaSource.java
+++ b/library/core/src/main/java/com/google/android/exoplayer2/source/ads/ServerSideAdInsertionMediaSource.java
@@ -261,10 +261,12 @@ public final class ServerSideAdInsertionMediaSource extends BaseMediaSource
   public MediaPeriod createPeriod(MediaPeriodId id, Allocator allocator, long startPositionUs) {
     @Nullable SharedMediaPeriod sharedPeriod = null;
     Pair<Long, Object> sharedMediaPeriodKey = new Pair<>(id.windowSequenceNumber, id.periodUid);
+    boolean reusedSharedPeriod = false;
     if (lastUsedMediaPeriod != null) {
       if (lastUsedMediaPeriod.periodUid.equals(id.periodUid)) {
         sharedPeriod = lastUsedMediaPeriod;
         mediaPeriods.put(sharedMediaPeriodKey, sharedPeriod);
+        reusedSharedPeriod = true;
       } else {
         lastUsedMediaPeriod.release(mediaSource);
       }
@@ -295,6 +297,9 @@ public final class ServerSideAdInsertionMediaSource extends BaseMediaSource
         new MediaPeriodImpl(
             sharedPeriod, id, createEventDispatcher(id), createDrmEventDispatcher(id));
     sharedPeriod.add(mediaPeriod);
+    if (reusedSharedPeriod && sharedPeriod.trackSelections.length > 0) {
+      mediaPeriod.seekToUs(startPositionUs);
+    }
     return mediaPeriod;
   }