diff --git a/sdk/lib/rendering/box.dart b/sdk/lib/rendering/box.dart
index 2cb37e62f33..ccfea1208ef 100644
--- a/sdk/lib/rendering/box.dart
+++ b/sdk/lib/rendering/box.dart
@@ -260,7 +260,7 @@ abstract class RenderBox extends RenderObject {
     _debugDoingThisLayout = false;
   }
 
-  BoxConstraints get constraints { BoxConstraints result = super.constraints; return result; }
+  BoxConstraints get constraints => super.constraints;
   void performResize() {
     // default behaviour for subclasses that have sizedByParent = true
     size = constraints.constrain(Size.zero);
diff --git a/sdk/lib/widgets/fixed_height_scrollable.dart b/sdk/lib/widgets/fixed_height_scrollable.dart
index 8d122051733..21d8b81cf90 100644
--- a/sdk/lib/widgets/fixed_height_scrollable.dart
+++ b/sdk/lib/widgets/fixed_height_scrollable.dart
@@ -25,7 +25,7 @@ abstract class FixedHeightScrollable extends Scrollable {
   }
 
   ScrollBehavior createScrollBehavior() => new OverscrollBehavior();
-  OverscrollBehavior get scrollBehavior => super.scrollBehavior as OverscrollBehavior;
+  OverscrollBehavior get scrollBehavior => super.scrollBehavior;
 
   int _itemCount = 0;
   int get itemCount => _itemCount;