diff --git a/src/lib/adsb/AdsbConflict.cpp b/src/lib/adsb/AdsbConflict.cpp
index 08d13e12a4..976b322796 100644
--- a/src/lib/adsb/AdsbConflict.cpp
+++ b/src/lib/adsb/AdsbConflict.cpp
@@ -77,7 +77,7 @@ void AdsbConflict::detect_traffic_conflict(double lat_now, double lon_now, float
 			&& (fabsf(_crosstrack_error.distance) < _conflict_detection_params.crosstrack_separation);
 
 	const bool _crosstrack_separation_check = (fabsf(alt_now - _transponder_report.altitude) <
-			_conflict_detection_params.crosstrack_separation);
+			_conflict_detection_params.vertical_separation);
 
 	bool collision_time_check = false;