diff --git a/src/windows/new_campaign.c b/src/windows/new_campaign.c
index 611a8cb1f2..f2af8b3227 100644
--- a/src/windows/new_campaign.c
+++ b/src/windows/new_campaign.c
@@ -178,7 +178,7 @@ void window_new_campaign_open(sint16 campaignType)
 
 	// Take top 40 most reliable rides
 	if (numApplicableRides > 40) {
-		qsort(window_new_campaign_rides, countof(window_new_campaign_rides), sizeof(uint8), ride_value_compare);
+		qsort(window_new_campaign_rides, numApplicableRides, sizeof(uint8), ride_value_compare);
 		numApplicableRides = 40;
 	}