_thumb_panel = new ThumbPanel (this, f);
_sizer->Add (_thumb_panel, 1, wxEXPAND);
- int const m = max (1LU, f ? f->thumbs().size() - 1 : 0);
+ int const m = max ((size_t) 1, f ? f->thumbs().size() - 1 : 0);
_slider = new wxSlider (this, wxID_ANY, 0, 0, m);
_sizer->Add (_slider, 0, wxEXPAND | wxLEFT | wxRIGHT);
set_thumbnail (0);