Substitution ignoring combining marks

It seems that I at some point, or a default, has set s/// to
automatically ignore differences in combining marks, which at the
moment is a problem since I'm searching for the word "ánd", with
a combining accent, in a text with English as metalanguage![^1]
I've looked around in the help and in my .vimrc to no avail. I
guess I could comment out every uncommented :set in my .vimrc
until I hit the right one :-) but hopefully one of you can give me
the right answer quicker than that!

TIA,

/bpj

[^1]: The metalanguage is the language a text about a linguistic
subject is written *in*, as opposed to the language(s) it is
written *about* which is/are the object language(s).

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