diff --git a/packages/flutter/lib/src/rendering/block.dart b/packages/flutter/lib/src/rendering/block.dart
index 2977e814837..9c95effd54c 100644
--- a/packages/flutter/lib/src/rendering/block.dart
+++ b/packages/flutter/lib/src/rendering/block.dart
@@ -255,6 +255,7 @@ class RenderBlockViewport extends RenderBlockBase {
        super(children: children, direction: direction, itemExtent: itemExtent, minExtent: minExtent);
 
   bool _inCallback = false;
+  bool get hasLayer => true;
 
   /// Called during [layout] to determine the blocks children
   ///
diff --git a/packages/flutter/lib/src/widgets/homogeneous_viewport.dart b/packages/flutter/lib/src/widgets/homogeneous_viewport.dart
index db8e0f33728..64b823aee4e 100644
--- a/packages/flutter/lib/src/widgets/homogeneous_viewport.dart
+++ b/packages/flutter/lib/src/widgets/homogeneous_viewport.dart
@@ -148,7 +148,9 @@ class _HomogeneousViewportElement extends RenderObjectElement<HomogeneousViewpor
     assert(_layoutItemCount != null);
     List<Widget> newWidgets;
     if (_layoutItemCount > 0)
-      newWidgets = widget.builder(this, _layoutFirstIndex, _layoutItemCount);
+      newWidgets = widget.builder(this, _layoutFirstIndex, _layoutItemCount).map((Widget widget) {
+        return new RepaintBoundary(key: new ValueKey<Key>(widget.key), child: widget);
+      }).toList();
     else
       newWidgets = <Widget>[];
     _children = updateChildren(_children, newWidgets);