diff --git a/src/slic3r/GUI/ExtraRenderers.cpp b/src/slic3r/GUI/ExtraRenderers.cpp
index 4afcdd7e10..c0c4661da5 100644
--- a/src/slic3r/GUI/ExtraRenderers.cpp
+++ b/src/slic3r/GUI/ExtraRenderers.cpp
@@ -240,7 +240,7 @@ bool BitmapTextRenderer::GetValueFromEditorCtrl(wxWindow* ctrl, wxVariant& value
     if (!text_editor || text_editor->GetValue().IsEmpty())
         return false;
 
-    m_was_unusable_symbol = Slic3r::GUI::Plater::has_illegal_filename_characters(text_editor->GetValue());
+    m_was_unusable_symbol = Slic3r::GUI::has_illegal_characters(text_editor->GetValue());
     if (m_was_unusable_symbol)
         return false;
 
diff --git a/src/slic3r/GUI/GUI.cpp b/src/slic3r/GUI/GUI.cpp
index bc64d28084..9263e0505a 100644
--- a/src/slic3r/GUI/GUI.cpp
+++ b/src/slic3r/GUI/GUI.cpp
@@ -481,4 +481,26 @@ bool create_process(const boost::filesystem::path& path, const std::wstring& cmd
 }
 #endif //_WIN32
 
+
+bool has_illegal_characters(const wxString& wxs_name)
+{
+	const std::string name = into_u8(wxs_name);
+	return has_illegal_characters(name);
+}
+
+bool has_illegal_characters(const std::string& name)
+{
+	for (size_t i = 0; i < std::strlen(illegal_characters); i++)
+		if (name.find_first_of(illegal_characters[i]) != std::string::npos)
+			return true;
+
+	return false;
+}
+
+void show_illegal_characters_warning(wxWindow* parent)
+{
+	show_error(parent, format_wxstr("%1%\n%2% %3%", _L("The provided name is not valid;"),
+									_L("the following characters are not allowed:"), illegal_characters));
+}
+
 } } // namespaces GUI / Slic3r
diff --git a/src/slic3r/GUI/GUI.hpp b/src/slic3r/GUI/GUI.hpp
index 70abef3085..81fae05b18 100644
--- a/src/slic3r/GUI/GUI.hpp
+++ b/src/slic3r/GUI/GUI.hpp
@@ -29,6 +29,8 @@ class Print;
 
 namespace GUI {
 
+static constexpr char illegal_characters[] = "<>:/\\|?*\"";
+
 void disable_screensaver();
 void enable_screensaver();
 bool debugged();
@@ -102,6 +104,10 @@ void desktop_execute_get_result(wxString command, wxArrayString& output);
 bool create_process(const boost::filesystem::path& path, const std::wstring& cmd_opt, std::string& error_msg);
 #endif //_WIN32
 
+bool has_illegal_characters(const wxString& name);
+bool has_illegal_characters(const std::string& name);
+void show_illegal_characters_warning(wxWindow* parent);
+
 } // namespace GUI
 } // namespace Slic3r
 
diff --git a/src/slic3r/GUI/GUI_ObjectList.cpp b/src/slic3r/GUI/GUI_ObjectList.cpp
index db5b666ed6..e61d9f454d 100644
--- a/src/slic3r/GUI/GUI_ObjectList.cpp
+++ b/src/slic3r/GUI/GUI_ObjectList.cpp
@@ -4553,8 +4553,8 @@ void ObjectList::rename_item()
     if (new_name.IsEmpty())
         return;
 
-    if (Plater::has_illegal_filename_characters(new_name)) {
-        Plater::show_illegal_characters_warning(this);
+    if (has_illegal_characters(new_name)) {
+        show_illegal_characters_warning(this);
         return;
     }
 
@@ -4780,7 +4780,7 @@ void ObjectList::OnEditingDone(wxDataViewEvent &event)
     const auto renderer = dynamic_cast<BitmapTextRenderer*>(GetColumn(colName)->GetRenderer());
 
     if (renderer->WasCanceled())
-		wxTheApp->CallAfter([this]{ Plater::show_illegal_characters_warning(this); });
+		wxTheApp->CallAfter([this]{ show_illegal_characters_warning(this); });
 
 #ifdef __WXMSW__
 	// Workaround for entering the column editing mode on Windows. Simulate keyboard enter when another column of the active line is selected.
diff --git a/src/slic3r/GUI/Plater.cpp b/src/slic3r/GUI/Plater.cpp
index 931475d771..bdd24944db 100644
--- a/src/slic3r/GUI/Plater.cpp
+++ b/src/slic3r/GUI/Plater.cpp
@@ -150,29 +150,6 @@ wxDEFINE_EVENT(EVT_SLICING_COMPLETED,               wxCommandEvent);
 wxDEFINE_EVENT(EVT_PROCESS_COMPLETED,               SlicingProcessCompletedEvent);
 wxDEFINE_EVENT(EVT_EXPORT_BEGAN,                    wxCommandEvent);
 
-
-bool Plater::has_illegal_filename_characters(const wxString& wxs_name)
-{
-    std::string name = into_u8(wxs_name);
-    return has_illegal_filename_characters(name);
-}
-
-bool Plater::has_illegal_filename_characters(const std::string& name)
-{
-    const char* illegal_characters = "<>:/\\|?*\"";
-    for (size_t i = 0; i < std::strlen(illegal_characters); i++)
-        if (name.find_first_of(illegal_characters[i]) != std::string::npos)
-            return true;
-
-    return false;
-}
-
-void Plater::show_illegal_characters_warning(wxWindow* parent)
-{
-    show_error(parent, _L("The provided name is not valid;") + "\n" +
-        _L("the following characters are not allowed:") + " <>:/\\|?*\"");
-}
-
 // Plater::DropTarget
 
 class PlaterDropTarget : public wxFileDropTarget
@@ -5233,7 +5210,7 @@ void Plater::export_gcode(bool prefer_removable)
             auto check_for_error = [this](const boost::filesystem::path& path, wxString& err_out) -> bool {
                 const std::string filename = path.filename().string();
                 const std::string ext      = boost::algorithm::to_lower_copy(path.extension().string());
-                if (has_illegal_filename_characters(filename)) {
+                if (has_illegal_characters(filename)) {
                     err_out = _L("The provided file name is not valid.") + "\n" +
                               _L("The following characters are not allowed by a FAT file system:") + " <>:/\\|?*\"";
                     return true;
diff --git a/src/slic3r/GUI/Plater.hpp b/src/slic3r/GUI/Plater.hpp
index f894cd2fdc..b772d9f786 100644
--- a/src/slic3r/GUI/Plater.hpp
+++ b/src/slic3r/GUI/Plater.hpp
@@ -418,10 +418,6 @@ public:
     wxMenu* layer_menu();
     wxMenu* multi_selection_menu();
 
-    static bool has_illegal_filename_characters(const wxString& name);
-    static bool has_illegal_filename_characters(const std::string& name);
-    static void show_illegal_characters_warning(wxWindow* parent);
-
 private:
     void reslice_until_step_inner(int step, const ModelObject &object, bool postpone_error_messages);