diff --git a/stepmania/src/RageSoundReader_Chain.cpp b/stepmania/src/RageSoundReader_Chain.cpp
index 2cb6e1e2f3..0038504be7 100644
--- a/stepmania/src/RageSoundReader_Chain.cpp
+++ b/stepmania/src/RageSoundReader_Chain.cpp
@@ -290,7 +290,10 @@ int RageSoundReader_Chain::ReadBlock( int16_t *pBuffer, int iFrames )
 			iMaxFramesRead = max( iMaxFramesRead, iFramesRead );
 
 			if( m_iChannels == 2 && pSound->GetNumChannels() == 1 )
+			{
 				RageSoundUtil::ConvertMonoToStereoInPlace( Buffer, iSamplesRead );
+				iSamplesRead *= 2;
+			}
 
 			if( fabsf(s.fPan) > 0.0001f )
 				RageSoundUtil::Pan( Buffer, iFramesRead, s.fPan );