"Object doesn't support property or method 'defineProperty'"

[Daniel15]

I'm getting this error when I run the included sample with the MSIE engine:

An unhandled exception occurred while processing the request.

ReactScriptLoadException: Error while loading "~/wwwroot/js/Sample.jsx": Object doesn't support property or method 'defineProperty' (at line undefined column undefined)
Line: 52
Column:3

React.ReactEnvironment.EnsureUserScriptsLoaded() in ReactEnvironment.cs, line 179

Works fine with V8. There's no calls to defineProperty in Sample.jsx directly so I imagine it's something in React itself :/