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-rw-r--r--src/industry_cmd.cpp5
1 files changed, 3 insertions, 2 deletions
diff --git a/src/industry_cmd.cpp b/src/industry_cmd.cpp
index d28b490c3..88cdf7a09 100644
--- a/src/industry_cmd.cpp
+++ b/src/industry_cmd.cpp
@@ -2211,8 +2211,9 @@ static void ChangeIndustryProduction(Industry *i, bool monthly)
/* Recalculate production_rate
* For non-smooth economy these should always be synchronized with prod_level */
if (recalculate_multipliers) {
- i->production_rate[0] = min(indspec->production_rate[0] * i->prod_level / PRODLEVEL_DEFAULT, 0xFF);
- i->production_rate[1] = min(indspec->production_rate[1] * i->prod_level / PRODLEVEL_DEFAULT, 0xFF);
+ /* Rates are rounded up, so e.g. oilrig always produces some passengers */
+ i->production_rate[0] = min((indspec->production_rate[0] * i->prod_level + PRODLEVEL_DEFAULT - 1) / PRODLEVEL_DEFAULT, 0xFF);
+ i->production_rate[1] = min((indspec->production_rate[1] * i->prod_level + PRODLEVEL_DEFAULT - 1) / PRODLEVEL_DEFAULT, 0xFF);
}
/* Close if needed and allowed */