diff --git a/libraries/exoplayer_rtsp/src/main/java/androidx/media3/exoplayer/rtsp/reader/RtpVp8Reader.java b/libraries/exoplayer_rtsp/src/main/java/androidx/media3/exoplayer/rtsp/reader/RtpVp8Reader.java
index 46354e3ae1..f6c1debd0d 100644
--- a/libraries/exoplayer_rtsp/src/main/java/androidx/media3/exoplayer/rtsp/reader/RtpVp8Reader.java
+++ b/libraries/exoplayer_rtsp/src/main/java/androidx/media3/exoplayer/rtsp/reader/RtpVp8Reader.java
@@ -214,7 +214,7 @@ import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
             fragmentedSampleSizeBytes,
             /* offset= */ 0,
             /* cryptoData= */ null);
-    fragmentedSampleSizeBytes = 0;
+    fragmentedSampleSizeBytes = C.LENGTH_UNSET;
     fragmentedSampleTimeUs = C.TIME_UNSET;
     gotFirstPacketOfVp8Frame = false;
   }