diff --git a/src/kiri/slicer.js b/src/kiri/slicer.js
index 93873440..6320cf5c 100644
--- a/src/kiri/slicer.js
+++ b/src/kiri/slicer.js
@@ -715,8 +715,8 @@
 
         // create point map, unique point list and point group arrays
         input.forEach(function(line) {
-            p1 = cachedPoint(line.p1.round(5));
-            p2 = cachedPoint(line.p2.round(5));
+            p1 = cachedPoint(line.p1);
+            p2 = cachedPoint(line.p2);
             addConnected(p1,p2);
             addConnected(p2,p1);
         });