diff --git a/src/slic3r/GUI/Plater.cpp b/src/slic3r/GUI/Plater.cpp
index ea6dd3c09..c63ae73f2 100644
--- a/src/slic3r/GUI/Plater.cpp
+++ b/src/slic3r/GUI/Plater.cpp
@@ -2965,7 +2965,7 @@ void Plater::priv::msw_rescale_object_menu()
 
 wxString Plater::priv::get_project_filename(const wxString& extension) const
 {
-    return m_project_filename.empty() ? wxEmptyString : m_project_filename + extension;
+    return m_project_filename.empty() ? "" : m_project_filename + extension;
 }
 
 void Plater::priv::set_project_filename(const wxString& filename)