diff --git a/mpegaudio/mpegaudioframestream.cpp b/mpegaudio/mpegaudioframestream.cpp
index b986023..2cb5c6a 100644
--- a/mpegaudio/mpegaudioframestream.cpp
+++ b/mpegaudio/mpegaudioframestream.cpp
@@ -58,8 +58,7 @@ void MpegAudioFrameStream::internalParseHeader()
     m_bitrate = frame.isXingFramefieldPresent()
             ? ((static_cast<double>(m_size) * 8.0) / (static_cast<double>(frame.xingFrameCount() * frame.sampleCount()) / static_cast<double>(frame.samplingFrequency())) / 1024.0)
             : frame.bitrate();
-    m_bytesPerSecond = m_bitrate * 125;
-    m_duration = TimeSpan::fromSeconds(static_cast<double>(m_size) / (m_bitrate * 128.0));
+    m_duration = TimeSpan::fromSeconds(static_cast<double>(m_size) / (m_bytesPerSecond = m_bitrate * 125));
 }
 
 }