diff --git a/src/geo/polygon.js b/src/geo/polygon.js
index decef7bd..ee85691f 100644
--- a/src/geo/polygon.js
+++ b/src/geo/polygon.js
@@ -1942,7 +1942,7 @@ class Polygon {
         }
 
         let clip = this.toClipper(),
-            res = CLIB.Clipper.SimplifyPolygons(clip, FillNonZero);
+            res = Clipper.SimplifyPolygons(clip, FillNonZero);
 
         if (!(res && res.length)) {
             return null;