0.7.0 icons disappear with 6to5ify/babelify

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I'm using babelify instead of reactify to transform es6 + jsx to es5. This was without problems until 0.7.0. Now all icons disappear.

material-ui@0.6.1 with 6to5ify@4.1.1 or babelify@5.0.3

material-ui@0.7.0 with 6to5ify@4.1.1

material-ui@0.7.0 with babelify@5.0.3

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I didn't realize that the whole icon part of material-ui has been reworked for 0.7.0.