diff --git a/src/gfx_func.h b/src/gfx_func.h
--- a/src/gfx_func.h
+++ b/src/gfx_func.h
@@ -150,6 +150,7 @@ bool ToggleFullScreen(bool fs);
 /* gfx.cpp */
 byte GetCharacterWidth(FontSize size, uint32 key);
 byte GetDigitWidth(FontSize size = FS_NORMAL);
+uint GetBroadestDigit(FontSize size = FS_NORMAL);
 
 /**
  * Get height of a character for a given font size.