diff --git a/include/fcl/shape/geometric_shapes.h b/include/fcl/shape/geometric_shapes.h
index ad2fbff57..1b1070e5d 100644
--- a/include/fcl/shape/geometric_shapes.h
+++ b/include/fcl/shape/geometric_shapes.h
@@ -278,6 +278,7 @@ class Convex : public ShapeBase
     plane_dis = plane_dis_;
     num_planes = num_planes_;
     points = points_;
+    num_points = num_points_;
     polygons = polygons_;
     edges = NULL;