diff --git a/getid3/module.audio-video.matroska.php b/getid3/module.audio-video.matroska.php
index b2b187b6..59990662 100644
--- a/getid3/module.audio-video.matroska.php
+++ b/getid3/module.audio-video.matroska.php
@@ -342,7 +342,7 @@ public function Analyze()
 						switch ($trackarray['CodecID']) {
 							case 'A_PCM/INT/LIT':
 							case 'A_PCM/INT/BIG':
-								$track_info['bitrate'] = $trackarray['SamplingFrequency'] * $trackarray['Channels'] * $trackarray['BitDepth'];
+								$track_info['bitrate'] = $track_info['sample_rate'] * $track_info['channels'] * $trackarray['BitDepth'];
 								break;
 
 							case 'A_AC3':