diff --git a/src/slic3r/GUI/Gizmos/GLGizmoMeshBoolean.cpp b/src/slic3r/GUI/Gizmos/GLGizmoMeshBoolean.cpp
index 95036105e..d35f3716b 100644
--- a/src/slic3r/GUI/Gizmos/GLGizmoMeshBoolean.cpp
+++ b/src/slic3r/GUI/Gizmos/GLGizmoMeshBoolean.cpp
@@ -232,7 +232,7 @@ void GLGizmoMeshBoolean::on_render_input_window(float x, float y, float bottom_l
     const int max_cap_length = ImGui::GetStyle().WindowPadding.x + ImGui::GetStyle().ItemSpacing.x + std::max(ImGui::CalcTextSize(_u8L("Source Volume").c_str()).x, ImGui::CalcTextSize(_u8L("Tool Volume").c_str()).x);
     const int select_btn_length = 2 * ImGui::GetStyle().FramePadding.x + std::max(ImGui::CalcTextSize(("1 " + _u8L("selected")).c_str()).x, ImGui::CalcTextSize(_u8L("Select").c_str()).x);
 
-    auto selectable = [this](const wxString& label, bool selected, const ImVec2& size_arg) {
+    auto selectable = [this](const std::string& label, bool selected, const ImVec2& size_arg) {
         ImGui::PushStyleVar(ImGuiStyleVar_WindowPadding, { 0,0 });
 
         ImGuiWindow* window = ImGui::GetCurrentWindow();
@@ -305,8 +305,8 @@ void GLGizmoMeshBoolean::on_render_input_window(float x, float y, float bottom_l
     std::string cap_str1 = m_operation_mode != MeshBooleanOperation::Difference ? _u8L("Part 1") : _u8L("Subtract from");
     m_imgui->text(cap_str1);
     ImGui::SameLine(max_cap_length);
-    wxString select_src_str = m_src.mv ? "1 " + _u8L("selected") : _u8L("Select");
-    select_src_str << "##select_source_volume";
+    std::string select_src_str = m_src.mv ? "1 " + _u8L("selected") : _u8L("Select");
+    select_src_str += "##select_source_volume";
     ImGui::PushItemWidth(select_btn_length);
     if (selectable(select_src_str, m_selecting_state == MeshBooleanSelectingState::SelectSource, ImVec2(select_btn_length, 0)))
         m_selecting_state = MeshBooleanSelectingState::SelectSource;
@@ -334,8 +334,8 @@ void GLGizmoMeshBoolean::on_render_input_window(float x, float y, float bottom_l
     std::string cap_str2 = m_operation_mode != MeshBooleanOperation::Difference ? _u8L("Part 2") : _u8L("Subtract with");
     m_imgui->text(cap_str2);
     ImGui::SameLine(max_cap_length);
-    wxString select_tool_str = m_tool.mv ? "1 " + _u8L("selected") : _u8L("Select");
-    select_tool_str << "##select_tool_volume";
+    std::string select_tool_str = m_tool.mv ? "1 " + _u8L("selected") : _u8L("Select");
+    select_tool_str += "##select_tool_volume";
     ImGui::PushItemWidth(select_btn_length);
     if (selectable(select_tool_str, m_selecting_state == MeshBooleanSelectingState::SelectTool, ImVec2(select_btn_length, 0)))
         m_selecting_state = MeshBooleanSelectingState::SelectTool;