The microtype documentation clearly states:

With LuaTeX, load fontspec before microtype

However, this breaks hyphenation in some cases in the bibliography, created with biblatex/biber.

The same works with xelatex or if microtype is loaded before fontspec.

Minimal example:




  author   = {Doe, John and Doe, Jane and Smith, James},
  title    = {Really Nice English Title},
  journal  = {The Astrophysical Journal},
  langid   = {english},
  year     = {2011},


This produces missing hyphenation with lualatex (Astrophysical is in the margin) but correct hyphenation with xelatex.

If you load microtype before fontspec/polylossia the hyphenation is correct with lualatex as well.

TeXLive 2014, up to date. Tested on Arch and (X)Ubuntu.

  • Where does this behaviour come from?
  • Should I just ignore the microtype manual and load microtype before fontspec?
  • Why does it just happen with lualatex and just in the bibliography?
  • bug report to whom? BibLaTeX, Microtype or LuaLaTeX?
  • It's quite curious that no Overfull \hbox message is shown.
    – egreg
    Apr 14 '15 at 21:08
  • That left me wondering too.
    – MaxNoe
    Apr 14 '15 at 21:09
  • Seems very much like a LuaTeX bug.
    – egreg
    Apr 14 '15 at 21:10
  • Possibly related to References spilling out of margin in bibliography
    – Fato39
    Apr 14 '15 at 21:40
  • 1
    What are the downsides or side effects of loading microtype before fontspec?
    – MaxNoe
    Apr 15 '15 at 7:49

It looks like it was a bug in luatex.

This seems to have been fixed in the latest version of luatex, version 0.80.0, as provided in texlive 2015-pretest. Using these versions, the output is as expected:

enter image description here

  • Would you happen to know when this will be included in MiKTeX? I could only find a vague reference to Summer 2015.
    – Fato39
    Apr 15 '15 at 6:49
  • How can I obtain luatex 0.8? The latest released version is 0.79
    – MaxNoe
    Apr 15 '15 at 7:55
  • 2
    @MaxNoe: You can obtain luatex 0.8 from in the TexLive 2015 pretest: tug.org/texlive/pretest.html. But be aware that this is a pretest. It started two days ago. So use it only if you understand the implications. Such a pretest is not for critical documents with time pressure. Apr 15 '15 at 10:23
  • @MaxNoe you need to get the texlive 2015-pretest for that: tug.org/texlive/pretest.html . it is however, as the name implies, a prerelease so things may not fully fully working as they should. use at your own risk (i.e., if you are on a tight deadline for something important... don't:-))
    – ArTourter
    Apr 15 '15 at 10:25
  • Just installed it and it indeed solves the Problem.
    – MaxNoe
    Apr 15 '15 at 10:28

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