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-rw-r--r--src/newgrf_industries.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/newgrf_industries.cpp b/src/newgrf_industries.cpp
index 5f5d7693d..45e481988 100644
--- a/src/newgrf_industries.cpp
+++ b/src/newgrf_industries.cpp
@@ -329,7 +329,7 @@ uint32 IndustryGetVariable(const ResolverObject *object, byte variable, byte par
case 0xA6: return industry->type;
case 0xA7: return industry->founder;
case 0xA8: return industry->random_color;
- case 0xA9: return Clamp(0, industry->last_prod_year - 1920, 255);
+ case 0xA9: return Clamp(0, industry->last_prod_year - ORIGINAL_BASE_YEAR, 255);
case 0xAA: return industry->counter;
case 0xAB: return GB(industry->counter, 8, 8);
case 0xAC: return industry->was_cargo_delivered;