--- a/layout/generic/nsContainerFrame.cpp
+++ b/layout/generic/nsContainerFrame.cpp
@@ -1044,19 +1044,22 @@ nsContainerFrame::FinishReflowChild(nsIF
                                     nsPresContext*             aPresContext,
                                     const nsHTMLReflowState*   aReflowState,
                                     const nsHTMLReflowMetrics& aDesiredSize,
                                     nscoord                    aX,
                                     nscoord                    aY,
                                     uint32_t                   aFlags)
 {
   nsPoint curOrigin = aKidFrame->GetPosition();
-  nsRect  bounds(aX, aY, aDesiredSize.width, aDesiredSize.height);
 
-  aKidFrame->SetRect(bounds);
+  if (NS_FRAME_NO_MOVE_FRAME != (aFlags & NS_FRAME_NO_MOVE_FRAME)) {
+    aKidFrame->SetRect(nsRect(aX, aY, aDesiredSize.width, aDesiredSize.height));
+  } else {
+    aKidFrame->SetSize(nsSize(aDesiredSize.width, aDesiredSize.height));
+  }
 
   if (aKidFrame->HasView()) {
     nsView* view = aKidFrame->GetView();
     // Make sure the frame's view is properly sized and positioned and has
     // things like opacity correct
     SyncFrameViewAfterReflow(aPresContext, aKidFrame, view,
                              aDesiredSize.VisualOverflow(), aFlags);
   }