diff --git a/stepmania/src/ActorScroller.cpp b/stepmania/src/ActorScroller.cpp
index 1101217479..5a77e7a466 100644
--- a/stepmania/src/ActorScroller.cpp
+++ b/stepmania/src/ActorScroller.cpp
@@ -213,24 +213,24 @@ void ActorScroller::PositionItemsAndDrawPrimitives( bool bDrawPrimitives )
 	if( !m_quadMask.GetHidden() )
 	{
 		// write to z buffer so that top and bottom are clipped
-		float fPositionFullyOnScreenTop = -(m_fNumItemsToDraw-1)/2.f;
-		float fPositionFullyOnScreenBottom = (m_fNumItemsToDraw-1)/2.f;
-		float fPositionFullyOffScreenTop = fPositionFullyOnScreenTop - 1;
-		float fPositionFullyOffScreenBottom = fPositionFullyOnScreenBottom + 1;
+		// Draw an extra item; this is the one that will be masked.
+		float fNumItemsToDraw = m_fNumItemsToDraw+1;
+		float fPositionFullyOnScreenTop = -(fNumItemsToDraw)/2.f;
+		float fPositionFullyOnScreenBottom = (fNumItemsToDraw)/2.f;
 
-		m_exprTransformFunction.PositionItem( &m_quadMask, fPositionFullyOffScreenTop, -1, m_SubActors.size() );
+		m_exprTransformFunction.PositionItem( &m_quadMask, fPositionFullyOnScreenTop, -1, m_SubActors.size() );
 		if( bDrawPrimitives )	m_quadMask.Draw();
 
-		m_exprTransformFunction.PositionItem( &m_quadMask, fPositionFullyOffScreenBottom, m_SubActors.size(), m_SubActors.size() );
+		m_exprTransformFunction.PositionItem( &m_quadMask, fPositionFullyOnScreenBottom, m_SubActors.size(), m_SubActors.size() );
 		if( bDrawPrimitives )	m_quadMask.Draw();
 
-		fFirstItemToDraw = fPositionFullyOffScreenTop + m_fCurrentItem;
-		fLastItemToDraw = fPositionFullyOffScreenBottom + m_fCurrentItem;
+		fFirstItemToDraw = m_fCurrentItem - fNumItemsToDraw/2.f;
+		fLastItemToDraw = m_fCurrentItem + fNumItemsToDraw/2.f;
 	}
 	else
 	{
-		fFirstItemToDraw = m_fCurrentItem - (m_fNumItemsToDraw)/2.f;
-		fLastItemToDraw = m_fCurrentItem + (m_fNumItemsToDraw)/2.f;
+		fFirstItemToDraw = m_fCurrentItem - m_fNumItemsToDraw/2.f;
+		fLastItemToDraw = m_fCurrentItem + m_fNumItemsToDraw/2.f;
 	}
 
 	bool bDelayedDraw = m_bDrawByZPosition && !m_bLoop;