Adding a filter to ‘the_title’ without affecting titles from wp_list_pages()?

I have a filter a filter for ‘the_title’, e.g.:
add_filter('the_title', 'my_title_filter');
I’d like this to edit the title for the current page or post with a custom function – however, it seems that it also alters the titles of Pages in the navigation menus, called from wp_list_pages().

How can I have a filter that changes the title of the current Post or Page only, without affecting the titles of other Pages?