diff --git a/layout/base/nsPresShell.cpp b/layout/base/nsPresShell.cpp
index d8b3b5650563..d633de195116 100644
--- a/layout/base/nsPresShell.cpp
+++ b/layout/base/nsPresShell.cpp
@@ -2801,6 +2801,8 @@ PresShell::ResizeReflow(nscoord aWidth, nscoord aHeight)
     nsContainerFrame::PositionFrameView(mPresContext, rootFrame);
     rootFrame->Reflow(mPresContext, desiredSize, reflowState, status);
     rootFrame->SizeTo(mPresContext, desiredSize.width, desiredSize.height);
+    mPresContext->SetVisibleArea(nsRect(0,0,desiredSize.width,desiredSize.height));
+
     nsIView* view;
     rootFrame->GetView(mPresContext, &view);
     if (view) {
diff --git a/layout/html/base/src/nsPresShell.cpp b/layout/html/base/src/nsPresShell.cpp
index d8b3b5650563..d633de195116 100644
--- a/layout/html/base/src/nsPresShell.cpp
+++ b/layout/html/base/src/nsPresShell.cpp
@@ -2801,6 +2801,8 @@ PresShell::ResizeReflow(nscoord aWidth, nscoord aHeight)
     nsContainerFrame::PositionFrameView(mPresContext, rootFrame);
     rootFrame->Reflow(mPresContext, desiredSize, reflowState, status);
     rootFrame->SizeTo(mPresContext, desiredSize.width, desiredSize.height);
+    mPresContext->SetVisibleArea(nsRect(0,0,desiredSize.width,desiredSize.height));
+
     nsIView* view;
     rootFrame->GetView(mPresContext, &view);
     if (view) {