diff --git a/src/slic3r/GUI/GUI_ObjectList.cpp b/src/slic3r/GUI/GUI_ObjectList.cpp
index 1d64e6303..8cca45235 100644
--- a/src/slic3r/GUI/GUI_ObjectList.cpp
+++ b/src/slic3r/GUI/GUI_ObjectList.cpp
@@ -3039,7 +3039,7 @@ void ObjectList::boolean()
     Plater::TakeSnapshot snapshot(wxGetApp().plater(), "boolean");
 
     ModelObject* object = (*m_objects)[obj_idxs.front()];
-    TriangleMesh mesh = Plater::combine_mesh_fff(*object, -1, [this](const std::string& msg) {return wxGetApp().notification_manager()->push_plater_error_notification(msg); });
+    TriangleMesh mesh = Plater::combine_mesh_fff(*object, -1, [this](const std::string &msg) { return wxGetApp().notification_manager()->push_plater_warning_notification(msg); });
 
     // add mesh to model as a new object, keep the original object's name and config
     Model* model = object->get_model();