diff --git a/lib-sql/functions/placex_triggers.sql b/lib-sql/functions/placex_triggers.sql
index 9d0d73b51..6840f0931 100644
--- a/lib-sql/functions/placex_triggers.sql
+++ b/lib-sql/functions/placex_triggers.sql
@@ -1162,7 +1162,7 @@ BEGIN
     -- Use the linked point as the centre point of the geometry,
     -- but only if it is within the area of the boundary.
     geom := coalesce(location.centroid, ST_Centroid(location.geometry));
-    IF geom is not NULL AND ST_Within(geom, NEW.geometry) THEN
+    IF geom is not NULL AND ST_Covers(NEW.geometry, geom) THEN
         NEW.centroid := geom;
     END IF;