diff --git a/sky/sdk/example/widgets/piano.dart b/sky/sdk/example/widgets/piano.dart
index c976d4ae9c9e58c140ae7450fc825bd22c9eeb53..23737e210b2417b0166a959fb4a0f626a7788f98 100644
--- a/sky/sdk/example/widgets/piano.dart
+++ b/sky/sdk/example/widgets/piano.dart
@@ -68,7 +68,6 @@ class PianoApp extends App {
     }
     mediaService.close();
     // Are we leaking all the player connections?
-    scheduleBuild();
   }
 
   Widget build() {
diff --git a/sky/sdk/lib/widgets/animated_component.dart b/sky/sdk/lib/widgets/animated_component.dart
index 92683e094517393eb91e7ccb1a324805a17056f2..3ebb9c55670d41b59f12a321cfd9ddcb6fb6b654 100644
--- a/sky/sdk/lib/widgets/animated_component.dart
+++ b/sky/sdk/lib/widgets/animated_component.dart
@@ -13,22 +13,29 @@ abstract class AnimatedComponent extends StatefulComponent {
 
   final List<AnimationPerformance> _watchedPerformances = new List<AnimationPerformance>();
 
+  void _performanceChanged() {
+    setState(() {
+      // We don't actually have any state to change, per se,
+      // we just know that we have in fact changed state.
+    });
+  }
+
   void watch(AnimationPerformance performance) {
     assert(!_watchedPerformances.contains(performance));
     _watchedPerformances.add(performance);
     if (mounted)
-      performance.addListener(scheduleBuild);
+      performance.addListener(_performanceChanged);
   }
 
   void didMount() {
     for (AnimationPerformance performance in _watchedPerformances)
-      performance.addListener(scheduleBuild);
+      performance.addListener(_performanceChanged);
     super.didMount();
   }
 
   void didUnmount() {
     for (AnimationPerformance performance in _watchedPerformances)
-      performance.removeListener(scheduleBuild);
+      performance.removeListener(_performanceChanged);
     super.didUnmount();
   }
 
diff --git a/sky/sdk/lib/widgets/widget.dart b/sky/sdk/lib/widgets/widget.dart
index a7de0ca712bd5a4d53ee32325864089123114c5b..3624213922027aa693b3df123052a529b60b7f01 100644
--- a/sky/sdk/lib/widgets/widget.dart
+++ b/sky/sdk/lib/widgets/widget.dart
@@ -530,7 +530,7 @@ abstract class Component extends Widget {
   }
   void _dependenciesChanged() {
     // called by Inherited.sync()
-    scheduleBuild();
+    _scheduleBuild();
   }
 
   // order corresponds to _build_ order, not depth in the tree.
@@ -585,7 +585,7 @@ abstract class Component extends Widget {
     _sync(null, _slot);
   }
 
-  void scheduleBuild() {
+  void _scheduleBuild() {
     if (_isBuilding || _dirty || !_mounted)
       return;
     _dirty = true;
@@ -662,7 +662,7 @@ abstract class StatefulComponent extends Component {
   void setState(void fn()) {
     assert(!_disqualifiedFromEverAppearingAgain);
     fn();
-    scheduleBuild();
+    _scheduleBuild();
   }
 }
 
@@ -1190,7 +1190,7 @@ void runApp(App app, { RenderView renderViewOverride, bool enableProfilingLoop:
   _container = new AppContainer(app);
   if (enableProfilingLoop) {
     new Timer.periodic(const Duration(milliseconds: 20), (_) {
-      app.scheduleBuild();
+      app._scheduleBuild();
     });
   }
 }