diff --git a/track_test.go b/track_test.go
index bec1d4ab..e578ad5b 100644
--- a/track_test.go
+++ b/track_test.go
@@ -167,8 +167,8 @@ func TestTrackNewFromMediaDescription(t *testing.T) {
 				channelCount:     2,
 				mpegConf:         []byte{0x11, 0x90},
 				sizeLength:       13,
-				indexLength:      0,
-				indexDeltaLength: 0,
+				indexLength:      3,
+				indexDeltaLength: 3,
 			},
 		},
 		{