diff --git a/src/GUI/Plater/Plate2D.cpp b/src/GUI/Plater/Plate2D.cpp
index e2a4162bf..36997560e 100644
--- a/src/GUI/Plater/Plate2D.cpp
+++ b/src/GUI/Plater/Plate2D.cpp
@@ -97,6 +97,10 @@ void Plate2D::repaint(wxPaintEvent& e) {
     }
 
 
+void Plate2D::clean_instance_thumbnails() {
+    for (auto& obj : this->objects) {
+        obj.instance_thumbnails.clear();
+    }
 }
 
 void Plate2D::mouse_drag(wxMouseEvent& e) {
diff --git a/src/GUI/Plater/Plate2D.hpp b/src/GUI/Plater/Plate2D.hpp
index 1db726a11..42ec6f786 100644
--- a/src/GUI/Plater/Plate2D.hpp
+++ b/src/GUI/Plater/Plate2D.hpp
@@ -119,6 +119,9 @@ private:
         return this->point_to_model_units(pt.x, pt.y);
     }
 
+    /// Remove all instance thumbnails.
+    void clean_instance_thumbnails();
+
 };
 
 } } // Namespace Slic3r::GUI