diff --git a/src/saveload/misc_sl.cpp b/src/saveload/misc_sl.cpp
--- a/src/saveload/misc_sl.cpp
+++ b/src/saveload/misc_sl.cpp
@@ -74,7 +74,8 @@ static const SaveLoad _date_desc[] = {
 	SLEG_CONDVAR("date",                   _date,                   SLE_FILE_U16 | SLE_VAR_I32,  SL_MIN_VERSION,  SLV_31),
 	SLEG_CONDVAR("date",                   _date,                   SLE_INT32,                  SLV_31, SL_MAX_VERSION),
 	    SLEG_VAR("date_fract",             _date_fract,             SLE_UINT16),
-	    SLEG_VAR("tick_counter",         _tick_counter,           SLE_UINT16),
+	SLEG_CONDVAR("tick_counter",           _tick_counter,           SLE_FILE_U16 | SLE_VAR_U64,  SL_MIN_VERSION, SLV_U64_TICK_COUNTER),
+	SLEG_CONDVAR("tick_counter",           _tick_counter,           SLE_UINT64,                  SLV_U64_TICK_COUNTER, SL_MAX_VERSION),
 	SLEG_CONDVAR("age_cargo_skip_counter", _age_cargo_skip_counter, SLE_UINT8,                   SL_MIN_VERSION, SLV_162),
 	SLEG_CONDVAR("cur_tileloop_tile",      _cur_tileloop_tile,      SLE_FILE_U16 | SLE_VAR_U32,  SL_MIN_VERSION, SLV_6),
 	SLEG_CONDVAR("cur_tileloop_tile",      _cur_tileloop_tile,      SLE_UINT32,                  SLV_6, SL_MAX_VERSION),