diff --git a/rogueviz/rogueviz.h b/rogueviz/rogueviz.h
index 296df8b3..01646b26 100644
--- a/rogueviz/rogueviz.h
+++ b/rogueviz/rogueviz.h
@@ -272,6 +272,7 @@ function<void(presmode)> roguevizslide_action(char c, const T& t, const U& act)
   static constexpr flagtype LATEX_COLOR = 1;
   
   void show_latex(presmode mode, string s);
+  string latex_cachename(string s, flagtype flags);
   void dialog_add_latex(string s, color_t color, int size = 100, flagtype flag = 0);
   void dialog_may_latex(string latex, string normal, color_t col = dialog::dialogcolor, int size = 100, flagtype flag = 0);
   void uses_game(presmode mode, string name, reaction_t launcher, reaction_t restore);