diff --git a/packages/flutter/lib/src/rendering/object.dart b/packages/flutter/lib/src/rendering/object.dart
index abec953c3c..efd9e75578 100644
--- a/packages/flutter/lib/src/rendering/object.dart
+++ b/packages/flutter/lib/src/rendering/object.dart
@@ -464,6 +464,7 @@ abstract class RenderObject extends AbstractNode implements HitTestTarget {
     assert(child.parentData != null);
     child._cleanRelayoutSubtreeRoot();
     child.parentData.detach();
+    child.parentData = null;
     super.dropChild(child);
     markNeedsLayout();
     _markNeedsCompositingBitsUpdate();
diff --git a/packages/unit/test/rendering/box_test.dart b/packages/unit/test/rendering/box_test.dart
index 680ede0236..cac8d1d664 100644
--- a/packages/unit/test/rendering/box_test.dart
+++ b/packages/unit/test/rendering/box_test.dart
@@ -73,4 +73,25 @@ void main() {
     expect(coloredBox.size.width, equals(780.0));
     expect(coloredBox.size.height, equals(580.0));
   });
+
+  test("reparenting should clear position", () {
+    RenderDecoratedBox coloredBox = new RenderDecoratedBox(
+      decoration: new BoxDecoration());
+    RenderPadding paddedBox = new RenderPadding(
+      child: coloredBox, padding: const EdgeDims.all(10.0));
+
+    layout(paddedBox);
+
+    BoxParentData parentData = coloredBox.parentData;
+    expect(parentData.position.x, isNot(equals(0.0)));
+
+    paddedBox.child = null;
+    RenderConstrainedBox constraintedBox = new RenderConstrainedBox(
+      child: coloredBox, additionalConstraints: const BoxConstraints());
+
+    layout(constraintedBox);
+
+    parentData = coloredBox.parentData;
+    expect(parentData.position.x, equals(0.0));
+  });
 }