fixes [skip ci]
fixes [skip ci]

Ref https://github.com/babel/babel/issues/4590#issuecomment-254359917
vadzim/babel,maurobringolf/babel,kedromelon/babel,jridgewell/babel,tikotzky/babel,babel/babel,hzoo/babel,zjmiller/babel,samwgoldman/babel,existentialism/babel,hzoo/babel,garyjN7/babel,chicoxyzzy/babel,kellyselden/babel,kedromelon/babel,garyjN7/babel,kassens/babel,existentialism/babel,jridgewell/babel,hzoo/babel,hulkish/babel,STRML/babel,chicoxyzzy/babel,claudiopro/babel,jridgewell/babel,guybedford/babel,shuhei/babel,bcoe/babel,shuhei/babel,kedromelon/babel,claudiopro/babel,Skillupco/babel,tikotzky/babel,kaicataldo/babel,vadzim/babel,chicoxyzzy/babel,zertosh/babel,kaicataldo/babel,guybedford/babel,STRML/babel,kaicataldo/babel,babel/babel,maurobringolf/babel,hulkish/babel,existentialism/babel,jridgewell/babel,babel/babel,Skillupco/babel,shuhei/babel,PolymerLabs/babel,babel/babel,kellyselden/babel,hzoo/babel,ccschneidr/babel,Skillupco/babel,samwgoldman/babel,kellyselden/babel,hulkish/babel,kellyselden/babel,rmacklin/babel,bcoe/babel,PolymerLabs/babel,claudiopro/babel,kassens/babel,kaicataldo/babel,samwgoldman/babel,Skillupco/babel,hulkish/babel,chicoxyzzy/babel,zertosh/babel,maurobringolf/babel,ccschneidr/babel,guybedford/babel,zjmiller/babel,PolymerLabs/babel,rmacklin/babel