diff --git a/src/date.cpp b/src/date.cpp
--- a/src/date.cpp
+++ b/src/date.cpp
@@ -27,7 +27,7 @@ Year      _cur_year;   ///< Current year
 Month     _cur_month;  ///< Current month (0..11)
 Date      _date;       ///< Current date in days (day counter)
 DateFract _date_fract; ///< Fractional part of the day.
-uint16 _tick_counter;  ///< Ever incrementing (and sometimes wrapping) tick counter for setting off various events
+uint64 _tick_counter;  ///< Ever incrementing tick counter for setting off various events
 
 /**
  * Set the date.