diff --git a/src/slic3r/GUI/MainFrame.cpp b/src/slic3r/GUI/MainFrame.cpp
index 3fccb7f84..9fc3a6ac5 100644
--- a/src/slic3r/GUI/MainFrame.cpp
+++ b/src/slic3r/GUI/MainFrame.cpp
@@ -116,6 +116,7 @@ DPIFrame(NULL, wxID_ANY, "", wxDefaultPosition, wxDefaultSize, wxDEFAULT_FRAME_S
     m_printhost_queue_dlg(new PrintHostQueueDialog(this))
     , m_recent_projects(9)
     , m_settings_dialog(this)
+    , diff_dialog(this)
 {
     // Fonts were created by the DPIFrame constructor for the monitor, on which the window opened.
     wxGetApp().update_fonts(this);
diff --git a/src/slic3r/GUI/UnsavedChangesDialog.cpp b/src/slic3r/GUI/UnsavedChangesDialog.cpp
index 68b115f09..4773af8ee 100644
--- a/src/slic3r/GUI/UnsavedChangesDialog.cpp
+++ b/src/slic3r/GUI/UnsavedChangesDialog.cpp
@@ -1386,8 +1386,8 @@ static std::string get_selection(PresetComboBox* preset_combo)
     return into_u8(preset_combo->GetString(preset_combo->GetSelection()));
 }
 
-DiffPresetDialog::DiffPresetDialog()
-    : DPIDialog(static_cast<wxWindow*>(wxGetApp().mainframe), wxID_ANY, wxEmptyString, wxDefaultPosition, wxDefaultSize, wxDEFAULT_DIALOG_STYLE | wxRESIZE_BORDER),
+DiffPresetDialog::DiffPresetDialog(MainFrame* mainframe)
+    : DPIDialog(mainframe, wxID_ANY, wxEmptyString, wxDefaultPosition, wxDefaultSize, wxDEFAULT_DIALOG_STYLE | wxRESIZE_BORDER),
     m_pr_technology(wxGetApp().preset_bundle->printers.get_edited_preset().printer_technology())
 {    
     wxColour bgr_clr = wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOW);
diff --git a/src/slic3r/GUI/UnsavedChangesDialog.hpp b/src/slic3r/GUI/UnsavedChangesDialog.hpp
index 12c215e56..06838d936 100644
--- a/src/slic3r/GUI/UnsavedChangesDialog.hpp
+++ b/src/slic3r/GUI/UnsavedChangesDialog.hpp
@@ -21,6 +21,7 @@ namespace GUI{
 
 class ModelNode;
 class PresetComboBox;
+class MainFrame;
 using ModelNodePtrArray = std::vector<std::unique_ptr<ModelNode>>;
 
 // On all of 3 different platforms Bitmap+Text icon column looks different 
@@ -333,7 +334,7 @@ class DiffPresetDialog : public DPIDialog
     std::vector<DiffPresets> m_preset_combos;
 
 public:
-    DiffPresetDialog();
+    DiffPresetDialog(MainFrame* mainframe);
     ~DiffPresetDialog() {}
 
     void                    show(Preset::Type type = Preset::TYPE_INVALID);