diff --git a/lib/ui/painting.dart b/lib/ui/painting.dart
index 6dc20808af62a..6f4a5a6025a76 100644
--- a/lib/ui/painting.dart
+++ b/lib/ui/painting.dart
@@ -873,7 +873,9 @@ typedef void ImageDecoderCallback(Image result);
 /// Obtain a FrameInfo with [Codec.getNextFrame].
 abstract class FrameInfo extends NativeFieldWrapperClass2 {
   // The duration this frame should be shown.
-  int get durationMillis native "FrameInfo_durationMillis";
+  Duration get duration => new Duration(milliseconds: _durationMillis);
+
+  int get _durationMillis native "FrameInfo_durationMillis";
 
   // The Image object for this frame.
   Image get image native "FrameInfo_image";
diff --git a/testing/dart/codec_test.dart b/testing/dart/codec_test.dart
index 0e3bf92d6b936..6b0c341e31dc0 100644
--- a/testing/dart/codec_test.dart
+++ b/testing/dart/codec_test.dart
@@ -41,7 +41,7 @@ void main() {
     for (int i = 0; i < 5; i++) {
       ui.FrameInfo frameInfo = await codec.getNextFrame();
       decodedFrameInfos.add([
-        frameInfo.durationMillis,
+        frameInfo.duration.inMilliseconds,
         frameInfo.image.width,
         frameInfo.image.height,
       ]);
@@ -62,7 +62,7 @@ void main() {
     for (int i = 0; i < 2; i++) {
       ui.FrameInfo frameInfo = await codec.getNextFrame();
       decodedFrameInfos.add([
-        frameInfo.durationMillis,
+        frameInfo.duration.inMilliseconds,
         frameInfo.image.width,
         frameInfo.image.height,
       ]);