diff --git a/packages/flutter/lib/src/cupertino/page.dart b/packages/flutter/lib/src/cupertino/page.dart
index a25ef52827..2e5ab53a6a 100644
--- a/packages/flutter/lib/src/cupertino/page.dart
+++ b/packages/flutter/lib/src/cupertino/page.dart
@@ -114,7 +114,7 @@ class _CupertinoEdgeShadowDecoration extends Decoration {
 /// A [BoxPainter] used to draw the page transition shadow using gradients.
 class _CupertinoEdgeShadowPainter extends BoxPainter {
   _CupertinoEdgeShadowPainter(
-    @required this._decoration,
+    this._decoration,
     VoidCallback onChange
   ) : assert(_decoration != null),
       super(onChange);
diff --git a/packages/flutter/lib/src/painting/box_painter.dart b/packages/flutter/lib/src/painting/box_painter.dart
index d176a87ad4..5b4a47aceb 100644
--- a/packages/flutter/lib/src/painting/box_painter.dart
+++ b/packages/flutter/lib/src/painting/box_painter.dart
@@ -1659,7 +1659,7 @@ class BoxDecoration extends Decoration {
 
 /// An object that paints a [BoxDecoration] into a canvas.
 class _BoxDecorationPainter extends BoxPainter {
-  _BoxDecorationPainter(@required this._decoration, VoidCallback onChange)
+  _BoxDecorationPainter(this._decoration, VoidCallback onChange)
     : assert(_decoration != null),
       super(onChange);