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-rw-r--r--engine.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/engine.c b/engine.c
index b845934a7..ef916d5c7 100644
--- a/engine.c
+++ b/engine.c
@@ -209,8 +209,11 @@ void StartupEngines(void)
e->flags = 0;
e->player_avail = 0;
+ // The magic value of 729 days below comes from the NewGRF spec. If the
+ // base intro date is before 1922 then the random number of days is not
+ // added.
r = Random();
- e->intro_date = ei->base_intro == 0 ? 0 : GB(r, 0, 9) + ei->base_intro;
+ e->intro_date = ei->base_intro <= 729 ? ei->base_intro : GB(r, 0, 9) + ei->base_intro;
if (e->intro_date <= _date) {
e->age = (_date - e->intro_date) >> 5;
e->player_avail = (byte)-1;