diff --git a/src/slic3r/GUI/GUI_Preview.cpp b/src/slic3r/GUI/GUI_Preview.cpp
index 06fc35e0f1..d4df93918f 100644
--- a/src/slic3r/GUI/GUI_Preview.cpp
+++ b/src/slic3r/GUI/GUI_Preview.cpp
@@ -169,27 +169,11 @@ void View3D::render()
 Preview::Preview(
     wxWindow* parent, Model* model, DynamicPrintConfig* config,
     BackgroundSlicingProcess* process, GCodeProcessor::Result* gcode_result, std::function<void()> schedule_background_process_func)
-    : m_canvas_widget(nullptr)
-    , m_canvas(nullptr)
-    , m_left_sizer(nullptr)
-    , m_layers_slider_sizer(nullptr)
-    , m_bottom_toolbar_panel(nullptr)
-    , m_label_view_type(nullptr)
-    , m_choice_view_type(nullptr)
-    , m_label_show(nullptr)
-    , m_combochecklist_features(nullptr)
-    , m_combochecklist_features_pos(0)
-    , m_combochecklist_options(nullptr)
-    , m_config(config)
+    : m_config(config)
     , m_process(process)
     , m_gcode_result(gcode_result)
-    , m_number_extruders(1)
     , m_preferred_color_mode("feature")
-    , m_loaded(false)
     , m_schedule_background_process(schedule_background_process_func)
-#ifdef __linux__
-    , m_volumes_cleanup_required(false)
-#endif // __linux__
 {
     if (init(parent, model))
         load_print();
diff --git a/src/slic3r/GUI/GUI_Preview.hpp b/src/slic3r/GUI/GUI_Preview.hpp
index 5c4083853a..980c137c52 100644
--- a/src/slic3r/GUI/GUI_Preview.hpp
+++ b/src/slic3r/GUI/GUI_Preview.hpp
@@ -76,17 +76,17 @@ private:
 
 class Preview : public wxPanel
 {
-    wxGLCanvas* m_canvas_widget;
-    GLCanvas3D* m_canvas;
-    wxBoxSizer* m_left_sizer;
-    wxBoxSizer* m_layers_slider_sizer;
-    wxPanel* m_bottom_toolbar_panel;
-    wxStaticText* m_label_view_type;
-    wxChoice* m_choice_view_type;
-    wxStaticText* m_label_show;
-    wxComboCtrl* m_combochecklist_features;
-    size_t m_combochecklist_features_pos;
-    wxComboCtrl* m_combochecklist_options;
+    wxGLCanvas* m_canvas_widget { nullptr };
+    GLCanvas3D* m_canvas { nullptr };
+    wxBoxSizer* m_left_sizer { nullptr };
+    wxBoxSizer* m_layers_slider_sizer { nullptr };
+    wxPanel* m_bottom_toolbar_panel { nullptr };
+    wxStaticText* m_label_view_type { nullptr };
+    wxChoice* m_choice_view_type { nullptr };
+    wxStaticText* m_label_show { nullptr };
+    wxComboCtrl* m_combochecklist_features { nullptr };
+    size_t m_combochecklist_features_pos { 0 };
+    wxComboCtrl* m_combochecklist_options { nullptr };
 
     DynamicPrintConfig* m_config;
     BackgroundSlicingProcess* m_process;
@@ -95,16 +95,16 @@ class Preview : public wxPanel
 #ifdef __linux__
     // We are getting mysterious crashes on Linux in gtk due to OpenGL context activation GH #1874 #1955.
     // So we are applying a workaround here.
-    bool m_volumes_cleanup_required;
+    bool m_volumes_cleanup_required { false };
 #endif /* __linux__ */
 
     // Calling this function object forces Plater::schedule_background_process.
     std::function<void()> m_schedule_background_process;
 
-    unsigned int m_number_extruders;
+    unsigned int m_number_extruders { 1 };
     std::string m_preferred_color_mode;
 
-    bool m_loaded;
+    bool m_loaded { false };
 
     DoubleSlider::Control* m_layers_slider{ nullptr };
     DoubleSlider::Control* m_moves_slider{ nullptr };