diff --git a/core/src/main/java/com/graphhopper/isochrone/algorithm/ContourBuilder.java b/core/src/main/java/com/graphhopper/isochrone/algorithm/ContourBuilder.java
index 0edc2e0be40..9f100b3dd5e 100644
--- a/core/src/main/java/com/graphhopper/isochrone/algorithm/ContourBuilder.java
+++ b/core/src/main/java/com/graphhopper/isochrone/algorithm/ContourBuilder.java
@@ -13,7 +13,7 @@ the License, or (at your option) any later version.
 
 package com.graphhopper.isochrone.algorithm;
 
-import org.locationtech.jts.algorithm.CGAlgorithms;
+import org.locationtech.jts.algorithm.Area;
 import org.locationtech.jts.geom.*;
 import org.locationtech.jts.geom.prep.PreparedPolygon;
 import org.locationtech.jts.triangulate.quadedge.Vertex;
@@ -125,7 +125,7 @@ private List<Polygon> punchHoles(List<LinearRing> rings) {
         List<LinearRing> holes = new ArrayList<>(rings.size() / 2);
         // 1. Split the polygon list in two: shells and holes (CCW and CW)
         for (LinearRing ring : rings) {
-            if (CGAlgorithms.signedArea(ring.getCoordinateSequence()) > 0.0)
+            if (Area.ofRingSigned(ring.getCoordinateSequence()) > 0.0)
                 holes.add(ring);
             else
                 shells.add(new PreparedPolygon(geometryFactory.createPolygon(ring)));
@@ -157,4 +157,4 @@ private List<Polygon> punchHoles(List<LinearRing> rings) {
         }
         return punched;
     }
-}
\ No newline at end of file
+}