diff --git a/src/voronoi/_impl/_convex_intersection_for.scad b/src/voronoi/_impl/_convex_intersection_for.scad
index 2e30ca03..b2b60505 100644
--- a/src/voronoi/_impl/_convex_intersection_for.scad
+++ b/src/voronoi/_impl/_convex_intersection_for.scad
@@ -1,13 +1,13 @@
 use <_convex_intersection.scad>;
 
 function _convex_intersection_for_impl(shapes, pre, leng, i = 2) = 
-    i == leng ? pre :
-    let(r = _convex_intersection(pre, shapes[i]))
-    r == [] ? r 
-            : _convex_intersection_for_impl(shapes, 
-                  r, 
-                  leng, i + 1
-              );
+    pre == [] || i == leng ? pre :
+                            _convex_intersection_for_impl(
+                                shapes, 
+                                _convex_intersection(pre, shapes[i]), 
+                                leng, 
+                                i + 1
+                            );
                 
 function _convex_intersection_for(shapes) = 
     let(leng = len(shapes))