diff --git a/algorithm/overlay/chain/intersection_interior.go b/algorithm/overlay/chain/intersection_interior.go
index 2c2d01d..c6bca88 100644
--- a/algorithm/overlay/chain/intersection_interior.go
+++ b/algorithm/overlay/chain/intersection_interior.go
@@ -31,7 +31,7 @@ func (ii *IntersectionInterior) ProcessIntersections(
 			if ip.IsCollinear {
 				continue
 			}
-			ii.Intersections = append(ii.Intersections, ips...)
+			ii.Intersections = append(ii.Intersections, ip)
 		}
 	}
 }