diff --git a/src/windows/ride.c b/src/windows/ride.c
index ff84a7e466..b5e12c8237 100644
--- a/src/windows/ride.c
+++ b/src/windows/ride.c
@@ -5878,6 +5878,9 @@ static void window_ride_customer_paint()
 
 	// Age
 	age = (RCT2_GLOBAL(RCT2_ADDRESS_CURRENT_MONTH_YEAR, uint16) - ride->build_date) / 8;
+	if (age < 0) {
+		age +=8192;
+	}
 	stringId = age == 0 ?
 		STR_BUILT_THIS_YEAR :
 		age == 1 ?