--- a/layout/xul/grid/nsGridRowGroupLayout.cpp
+++ b/layout/xul/grid/nsGridRowGroupLayout.cpp
@@ -168,17 +168,16 @@ void nsGridRowGroupLayout::CountRowsColu
       // first see if it is a scrollframe. If so walk down into it and get the
       // scrolled child
       nsIFrame* deepChild = nsGrid::GetScrolledBox(child);
 
       nsIGridPart* monument = nsGrid::GetPartFromBox(deepChild);
       if (monument) {
         monument->CountRowsColumns(deepChild, aRowCount, aComputedColumnCount);
         child = nsBox::GetNextXULBox(child);
-        deepChild = child;
         continue;
       }
 
       child = nsBox::GetNextXULBox(child);
 
       // if not a monument. Then count it. It will be a bogus row
       aRowCount++;
     }
@@ -200,17 +199,16 @@ int32_t nsGridRowGroupLayout::BuildRows(
       // first see if it is a scrollframe. If so walk down into it and get the
       // scrolled child
       nsIFrame* deepChild = nsGrid::GetScrolledBox(child);
 
       nsIGridPart* monument = nsGrid::GetPartFromBox(deepChild);
       if (monument) {
         rowCount += monument->BuildRows(deepChild, &aRows[rowCount]);
         child = nsBox::GetNextXULBox(child);
-        deepChild = child;
         continue;
       }
 
       aRows[rowCount].Init(child, true);
 
       child = nsBox::GetNextXULBox(child);
 
       // if not a monument. Then count it. It will be a bogus row