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bflabel undefined: LaTeX error

Today, uploading a document in LaTeX to Overleaf, I got the following error while waiting for the remote preview:

./classicthesis-preamble.sty:137: LaTeX Error: bflabel undefined.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.

l.137 renewcommand{bflabel}
                          [1]{{#1}hfill} % fix the list of acronyms

OMG! What’s happening? I never received that error from my classicthesis-preample.sty script. Googling I found the answer: bflabel is not being used in the newest implementation of acronym.sty, because aclabelfont had been introduced without backward compatibility.

Great! The problem is due to the fact that I like building packages by myself: I installed acronym.sty probably a couple of years ago and I have never updated it.

So I removed the old package, I downloaded and built the new package and I was able to build my document again.


Published by Francesco Serafin

I am a PhD student at the Department of Civil, Environmental and Mechanical Engineering at the University of Trento. My two greatest loves: Computer Science and Water (take three with my Lenovo!:D). As a result, the aim of my life is to make both passions coexist. My gpg public key available at

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