diff --git a/src/slic3r/GUI/BackgroundSlicingProcess.cpp b/src/slic3r/GUI/BackgroundSlicingProcess.cpp
index 27aa6eaa6..c4e6272ba 100644
--- a/src/slic3r/GUI/BackgroundSlicingProcess.cpp
+++ b/src/slic3r/GUI/BackgroundSlicingProcess.cpp
@@ -219,7 +219,7 @@ void BackgroundSlicingProcess::thread_proc()
             wxString errmsg = wxString::Format(_(L("%s has encountered an error. It was likely caused by running out of memory. "
                                   "If you are sure you have enough RAM on your system, this may also be a bug and we would "
                                   "be glad if you reported it.")), SLIC3R_APP_NAME);
-            error = errmsg.ToStdString() + "\n\n" + std::string(ex.what());
+            error = std::string(errmsg.ToUTF8()) + "\n\n" + std::string(ex.what());
         } catch (std::exception &ex) {
 			error = ex.what();
 		} catch (...) {
diff --git a/src/slic3r/GUI/ConfigSnapshotDialog.cpp b/src/slic3r/GUI/ConfigSnapshotDialog.cpp
index d48dfccc9..fbc1794ee 100644
--- a/src/slic3r/GUI/ConfigSnapshotDialog.cpp
+++ b/src/slic3r/GUI/ConfigSnapshotDialog.cpp
@@ -162,7 +162,7 @@ void ConfigSnapshotDialog::on_dpi_changed(const wxRect &suggested_rect)
 
 void ConfigSnapshotDialog::onLinkClicked(wxHtmlLinkEvent &event)
 {
-    m_snapshot_to_activate = event.GetLinkInfo().GetHref();
+    m_snapshot_to_activate = event.GetLinkInfo().GetHref().ToUTF8();
     this->EndModal(wxID_CLOSE);
 }
 
diff --git a/src/slic3r/GUI/GLCanvas3D.cpp b/src/slic3r/GUI/GLCanvas3D.cpp
index 496de1d54..adc1e2e44 100644
--- a/src/slic3r/GUI/GLCanvas3D.cpp
+++ b/src/slic3r/GUI/GLCanvas3D.cpp
@@ -274,7 +274,7 @@ void GLCanvas3D::LayersEditing::render_overlay(const GLCanvas3D& canvas) const
     if (ImGui::IsItemHovered())
     {
         ImGui::BeginTooltip();
-        ImGui::TextUnformatted(_(L("Higher print quality versus higher print speed.")));
+        ImGui::TextUnformatted(_(L("Higher print quality versus higher print speed.")).ToUTF8());
         ImGui::EndTooltip();
     }
 
@@ -1302,7 +1302,7 @@ void GLCanvas3D::Labels::render(const std::vector<const ModelInstance*>& sorted_
                 return owner.model_instance_id == id;
                 });
             if (it != owners.end())
-                it->print_order = _(L("Seq.")) + "#: " + std::to_string(i + 1);
+                it->print_order = std::string((_(L("Seq."))).ToUTF8()) + "#: " + std::to_string(i + 1);
         }
     }
 
diff --git a/src/slic3r/GUI/Plater.cpp b/src/slic3r/GUI/Plater.cpp
index 8296e15d5..9e003aac5 100644
--- a/src/slic3r/GUI/Plater.cpp
+++ b/src/slic3r/GUI/Plater.cpp
@@ -322,7 +322,7 @@ PresetBitmapComboBox(parent, wxSize(15 * wxGetApp().em_unit(), -1)),
             dialog.CenterOnParent();
             if (dialog.ShowModal() == wxID_OK)
             {
-                colors->values[extruder_idx] = dialog.GetColourData().GetColour().GetAsString(wxC2S_HTML_SYNTAX);
+                colors->values[extruder_idx] = dialog.GetColourData().GetColour().GetAsString(wxC2S_HTML_SYNTAX).ToStdString();
 
                 DynamicPrintConfig cfg_new = *cfg;
                 cfg_new.set_key_value("extruder_colour", colors);
@@ -3077,7 +3077,7 @@ unsigned int Plater::priv::update_background_process(bool force_validation, bool
                 GUI::show_error(this->q, _(err));
             } else {
                 // Show the error message once the main window gets activated.
-                this->delayed_error_message = _(err);
+                this->delayed_error_message = _(err).ToUTF8();
             }
             return_state |= UPDATE_BACKGROUND_PROCESS_INVALID;
         }
diff --git a/src/slic3r/GUI/Tab.cpp b/src/slic3r/GUI/Tab.cpp
index 541be423d..ed3a93007 100644
--- a/src/slic3r/GUI/Tab.cpp
+++ b/src/slic3r/GUI/Tab.cpp
@@ -49,14 +49,14 @@ Tab::Tab(wxNotebook* parent, const wxString& title, Preset::Type type) :
     m_compatible_printers.type			= Preset::TYPE_PRINTER;
     m_compatible_printers.key_list		= "compatible_printers";
     m_compatible_printers.key_condition	= "compatible_printers_condition";
-    m_compatible_printers.dialog_title 	= _(L("Compatible printers"));
-    m_compatible_printers.dialog_label 	= _(L("Select the printers this profile is compatible with."));
+    m_compatible_printers.dialog_title 	= _(L("Compatible printers")).ToUTF8();
+    m_compatible_printers.dialog_label 	= _(L("Select the printers this profile is compatible with.")).ToUTF8();
 
     m_compatible_prints.type			= Preset::TYPE_PRINT;
     m_compatible_prints.key_list 		= "compatible_prints";
     m_compatible_prints.key_condition	= "compatible_prints_condition";
-    m_compatible_prints.dialog_title 	= _(L("Compatible print profiles"));
-    m_compatible_prints.dialog_label 	= _(L("Select the print profiles this profile is compatible with."));
+    m_compatible_prints.dialog_title 	= _(L("Compatible print profiles")).ToUTF8();
+    m_compatible_prints.dialog_label 	= _(L("Select the print profiles this profile is compatible with.")).ToUTF8();
 
     wxGetApp().tabs_list.push_back(this);
 
@@ -3032,7 +3032,7 @@ void Tab::save_preset(std::string name /*= ""*/)
         const Preset &preset = m_presets->get_selected_preset();
         auto default_name = preset.is_default ? "Untitled" :
 //                            preset.is_system ? (boost::format(_utf8(L("%1% - Copy"))) % preset.name).str() :
-                            preset.is_system ? (boost::format(_CTX_utf8(L_CONTEXT("%1% - Copy", "PresetName"), "PresetName")) % preset.name).str() :
+                            preset.is_system ? (boost::format(_CTX_utf8(L_CONTEXT("%1% - Copy", "PresetName"), "PresetName").ToUTF8()) % preset.name).str() :
                             preset.name;
 
         bool have_extention = boost::iends_with(default_name, ".ini");
diff --git a/src/slic3r/GUI/wxExtensions.cpp b/src/slic3r/GUI/wxExtensions.cpp
index 3f82c43e4..d3d9e61a2 100644
--- a/src/slic3r/GUI/wxExtensions.cpp
+++ b/src/slic3r/GUI/wxExtensions.cpp
@@ -603,7 +603,7 @@ void apply_extruder_selector(wxBitmapComboBox** ctrl,
             ++i;
         }
 
-        (*ctrl)->Append(use_full_item_name ? wxString::Format("%s %d", str, i) : std::to_string(i), *bmp);
+        (*ctrl)->Append(use_full_item_name ? wxString::Format("%s %d", str, i) : wxString::Format("%d", i), *bmp);
         ++i;
     }
     (*ctrl)->SetSelection(0);