Correction to: Nature Metabolism https://doi.org/10.1038/s42255-019-0126-8, published online 14 October 2019.

In the version of this article initially published, in ‘Measurements of mitochondrial Ca2+ influx’ in the Online Methods section, the description of the uAB solution did not include MgCl2 but should have listed 1 mM MgCl2. The error has been corrected in the HTML and PDF versions of the article.