diff --git a/src/lines-tile-component.coffee b/src/lines-tile-component.coffee
index be15b9b67..e0ad2f10f 100644
--- a/src/lines-tile-component.coffee
+++ b/src/lines-tile-component.coffee
@@ -113,8 +113,8 @@ class LinesTileComponent
       while oldLineNode = oldLineNodes.shift()
         break if @screenRowForNode(newLineNode) < @screenRowForNode(oldLineNode)
 
-      lineId = @lineIdsByScreenRow[newLineNode.dataset.screenRow]
-      @lineNodesByLineId[lineId] = newLineNode
+      id = @lineIdsByScreenRow[newLineNode.dataset.screenRow]
+      @lineNodesByLineId[id] = newLineNode
       if oldLineNode?
         @domNode.insertBefore(newLineNode, oldLineNode)
       else