diff --git a/src/slic3r/GUI/Gizmos/GLGizmoCut.cpp b/src/slic3r/GUI/Gizmos/GLGizmoCut.cpp
index 707726e08..d7bdf9474 100644
--- a/src/slic3r/GUI/Gizmos/GLGizmoCut.cpp
+++ b/src/slic3r/GUI/Gizmos/GLGizmoCut.cpp
@@ -282,21 +282,21 @@ void GLGizmoCut::update_contours()
     const GLVolume* first_glvolume = selection.get_volume(*selection.get_volume_idxs().begin());
     const BoundingBoxf3& box = first_glvolume->transformed_convex_hull_bounding_box();
 
-    const int object_idx = selection.get_object_idx();
+    const ModelObject* model_object = wxGetApp().model().objects[selection.get_object_idx()];
     const int instance_idx = selection.get_instance_idx();
 
     if (0.0 < m_cut_z && m_cut_z < m_max_z) {
-        if (m_cut_contours.cut_z != m_cut_z || m_cut_contours.object_idx != object_idx || m_cut_contours.instance_idx != instance_idx) {
+        if (m_cut_contours.cut_z != m_cut_z || m_cut_contours.object_id != model_object->id() || m_cut_contours.instance_idx != instance_idx) {
             m_cut_contours.cut_z = m_cut_z;
 
-            if (m_cut_contours.object_idx != object_idx) {
-                m_cut_contours.mesh = wxGetApp().plater()->model().objects[object_idx]->raw_mesh();
+            if (m_cut_contours.object_id != model_object->id()) {
+                m_cut_contours.mesh = model_object->raw_mesh();
                 m_cut_contours.mesh.repair();
             }
 
             m_cut_contours.position = box.center();
             m_cut_contours.shift = Vec3d::Zero();
-            m_cut_contours.object_idx = object_idx;
+            m_cut_contours.object_id = model_object->id();
             m_cut_contours.instance_idx = instance_idx;
             m_cut_contours.contours.reset();
 
diff --git a/src/slic3r/GUI/Gizmos/GLGizmoCut.hpp b/src/slic3r/GUI/Gizmos/GLGizmoCut.hpp
index abd879350..b691357af 100644
--- a/src/slic3r/GUI/Gizmos/GLGizmoCut.hpp
+++ b/src/slic3r/GUI/Gizmos/GLGizmoCut.hpp
@@ -5,6 +5,7 @@
 #if ENABLE_SINKING_CONTOURS
 #include "slic3r/GUI/GLModel.hpp"
 #include "libslic3r/TriangleMesh.hpp"
+#include "libslic3r/ObjectID.hpp"
 #endif // ENABLE_SINKING_CONTOURS
 
 namespace Slic3r {
@@ -33,7 +34,7 @@ class GLGizmoCut : public GLGizmoBase
         double cut_z{ 0.0 };
         Vec3d position{ Vec3d::Zero() };
         Vec3d shift{ Vec3d::Zero() };
-        int object_idx{ -1 };
+        ObjectID object_id;
         int instance_idx{ -1 };
     };