diff --git a/src/slic3r/GUI/MainFrame.cpp b/src/slic3r/GUI/MainFrame.cpp
index 5b38129de..41339262b 100644
--- a/src/slic3r/GUI/MainFrame.cpp
+++ b/src/slic3r/GUI/MainFrame.cpp
@@ -811,7 +811,7 @@ void MainFrame::on_value_changed(wxCommandEvent& event)
 void MainFrame::update_ui_from_settings()
 {
     bool bp_on = wxGetApp().app_config->get("background_processing") == "1";
-    m_menu_item_reslice_now->Enable(bp_on);
+    m_menu_item_reslice_now->Enable(!bp_on);
     m_plater->sidebar().show_reslice(!bp_on);
     m_plater->sidebar().Layout();
     if (m_plater)