diff --git a/stepmania/src/RageSoundManager.cpp b/stepmania/src/RageSoundManager.cpp
index 6ecb6b981d..2c1225bb55 100644
--- a/stepmania/src/RageSoundManager.cpp
+++ b/stepmania/src/RageSoundManager.cpp
@@ -270,7 +270,7 @@ void SoundMixBuffer::write( const Sint16 *buf, unsigned size, float volume, int
 	if( bufsize < realsize )
 	{
 		mixbuf = (Sint32 *) realloc( mixbuf, sizeof(Sint32) * realsize );
-		bufsize = size;
+		bufsize = realsize;
 	}
 
 	if( used < realsize )