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I am using the following in the preamble of my document to get symbols instead of numbers as footnote markers:

\usepackage{perpage}
\MakePerPage{footnote}
\usepackage{footmisc}[perpage,symbol*]
\renewcommand{\thefootnote}{\fnsymbol{footnote}}

For some obscure reason I need both perpage package and option for the per-page footnote counter reset to work... And it works with no problem.

But then if I make a footnote in the caption of an image, the marker will go back to alphabetical. Is there a way to alter that behavior as well?

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    If I remember correctly, \caption does use a minipage (-like) setting, which means that \footnote is actually controlled by \thempfootnote settings – user31729 Jul 30 '17 at 23:01
  • Hence the answer: tex.stackexchange.com/questions/18499/… – retrography Jul 30 '17 at 23:11
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As mentioned by Christian in the comments, the footnotes under a \caption are controlled by \thempfootnote and not \thefootnote. So, you need to renew that command as well:

\usepackage{perpage}
\MakePerPage{footnote}
\usepackage{footmisc}[perpage,symbol*]
\renewcommand{\thefootnote}{\fnsymbol{footnote}}
\renewcommand{\thempfootnote}{\fnsymbol{footnote}} % the new setting

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