diff --git a/library/smoothstreaming/src/main/java/com/google/android/exoplayer2/source/smoothstreaming/SsMediaPeriod.java b/library/smoothstreaming/src/main/java/com/google/android/exoplayer2/source/smoothstreaming/SsMediaPeriod.java
index 1cc2a6833d..05fe22226f 100644
--- a/library/smoothstreaming/src/main/java/com/google/android/exoplayer2/source/smoothstreaming/SsMediaPeriod.java
+++ b/library/smoothstreaming/src/main/java/com/google/android/exoplayer2/source/smoothstreaming/SsMediaPeriod.java
@@ -139,7 +139,9 @@ import java.util.ArrayList;
 
   @Override
   public void discardBuffer(long positionUs) {
-    // Do nothing.
+    for (ChunkSampleStream<SsChunkSource> sampleStream : sampleStreams) {
+      sampleStream.discardBuffer(positionUs);
+    }
   }
 
   @Override