Text Formatting ⇒ listings package - how can I fix bold keywords in comments

[drowsy]

I am having an issue with it:

it colorizes reserved keywords in comments.
for example:

% for this function you need ...

it makes "for" and "function" bold, and the rest of the line
just like normal comments, italic. Is there a way to fix this?

[drowsy]

weird, it works fine with language=Matlab, but
not with language=Octave ...

[daleif]

it is alwasy helpful to post minimal examples if you want help

[Juanjo]

Perhaps this thread may help.