Cannot open include file: 'IMovieScenePlayer.h'

While attempting to derive from the Widget Blueprint class the following error is reported by Visual Studio 2013:

    C:\Program Files\Epic Games\4.8\Engine\Source\Runtime\UMG\Public\Animation\WidgetAnimation.h(5): fatal error C1083: Cannot open include file: 'IMovieScenePlayer.h': No such file or directory

The IMovieScenePlayer.h file does exist in the following directory:

    C:\Program Files\Epic Games\4.8\Engine\Source\Runtime\MovieSceneCore\Public

To get around this error I’m adding the path in the Visual Studio Project Include Directories. Is this expected behavior? Is something wrong with my setup?