diff --git a/src/slic3r/GUI/ConfigWizard.cpp b/src/slic3r/GUI/ConfigWizard.cpp
index 58df5b1c09..e9767fd866 100644
--- a/src/slic3r/GUI/ConfigWizard.cpp
+++ b/src/slic3r/GUI/ConfigWizard.cpp
@@ -902,20 +902,7 @@ void PageMaterials::update_lists(int sel_type, int sel_vendor, int last_selected
 	wxArrayInt sel_printers;
 	int sel_printers_count = list_printer->GetSelections(sel_printers);
 
-    // Does our wxWidgets version support operator== for wxArrayInt ?
-#if wxCHECK_VERSION(3, 1, 1)
     if (sel_printers != sel_printers_prev) {
-#else
-    auto are_equal = [](const wxArrayInt& arr_first, const wxArrayInt& arr_second) {
-        if (arr_first.GetCount() != arr_second.GetCount())
-            return false;
-        for (size_t i = 0; i < arr_first.GetCount(); i++)
-            if (arr_first[i] != arr_second[i])
-                return false;
-        return true;
-    };
-    if (!are_equal(sel_printers, sel_printers_prev)) {
-#endif
 
         // Refresh type list
 		list_type->Clear();
diff --git a/src/slic3r/GUI/ExtraRenderers.hpp b/src/slic3r/GUI/ExtraRenderers.hpp
index b778df4c49..f7be8040b7 100644
--- a/src/slic3r/GUI/ExtraRenderers.hpp
+++ b/src/slic3r/GUI/ExtraRenderers.hpp
@@ -5,7 +5,7 @@
 
 #include <wx/dataview.h>
 
-#if wxUSE_MARKUP && wxCHECK_VERSION(3, 1, 1)
+#if wxUSE_MARKUP
     #define SUPPORTS_MARKUP
 #endif
 
diff --git a/src/slic3r/GUI/GUI_App.hpp b/src/slic3r/GUI/GUI_App.hpp
index f89f583873..e89ac33cae 100644
--- a/src/slic3r/GUI/GUI_App.hpp
+++ b/src/slic3r/GUI/GUI_App.hpp
@@ -147,7 +147,7 @@ class GizmoObjectManipulation;
 static wxString dots("...", wxConvUTF8);
 
 // Does our wxWidgets version support markup?
-#if wxUSE_MARKUP && wxCHECK_VERSION(3, 1, 1)
+#if wxUSE_MARKUP
     #define SUPPORTS_MARKUP
 #endif
 
diff --git a/src/slic3r/GUI/GUI_Utils.cpp b/src/slic3r/GUI/GUI_Utils.cpp
index 9eeea88597..5d7dde4d93 100644
--- a/src/slic3r/GUI/GUI_Utils.cpp
+++ b/src/slic3r/GUI/GUI_Utils.cpp
@@ -243,12 +243,7 @@ bool check_dark_mode() {
         return value <= 0;
     }
 #endif
-#if wxCHECK_VERSION(3,1,3)
     return wxSystemSettings::GetAppearance().IsDark();
-#else
-    const unsigned luma = wxGetApp().get_colour_approx_luma(wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOW));
-    return luma < 128;
-#endif
 }
 
 
diff --git a/src/slic3r/GUI/I18N.hpp b/src/slic3r/GUI/I18N.hpp
index c80c9a1659..4c71649408 100644
--- a/src/slic3r/GUI/I18N.hpp
+++ b/src/slic3r/GUI/I18N.hpp
@@ -64,11 +64,7 @@ namespace I18N {
 	inline std::string translate_utf8(const std::wstring &s, const std::wstring &plural, unsigned int n) { return translate(s, plural, n).ToUTF8().data(); }
 	inline std::string translate_utf8(const wxString     &s, const wxString     &plural, unsigned int n) { return translate(s, plural, n).ToUTF8().data(); }
 
-#if wxCHECK_VERSION(3, 1, 1)
-	#define _wxGetTranslation_ctx(S, CTX) wxGetTranslation((S), wxEmptyString, (CTX))
-#else
-	#define _wxGetTranslation_ctx(S, CTX) ((void)(CTX), wxGetTranslation((S)))
-#endif
+#define _wxGetTranslation_ctx(S, CTX) wxGetTranslation((S), wxEmptyString, (CTX))
 
 	inline wxString translate(const char *s, const char* ctx)         { return _wxGetTranslation_ctx(wxString(s, wxConvUTF8), ctx); }
 	inline wxString translate(const wchar_t *s, const char* ctx)      { return _wxGetTranslation_ctx(s, ctx); }
diff --git a/src/slic3r/GUI/SendSystemInfoDialog.cpp b/src/slic3r/GUI/SendSystemInfoDialog.cpp
index cb8228ba28..a47119e429 100644
--- a/src/slic3r/GUI/SendSystemInfoDialog.cpp
+++ b/src/slic3r/GUI/SendSystemInfoDialog.cpp
@@ -481,7 +481,7 @@ static std::string generate_system_info_json()
         monitor_node.put("height", display.GetGeometry().GetHeight());
 
         // Only get the scaling on Win, it is not reliable on other platforms.
-        #if defined(_WIN32) && wxCHECK_VERSION(3, 1, 2)
+        #if defined(_WIN32)
             double scaling = display.GetPPI().GetWidth() / 96.;
             std::stringstream ss;
             ss << std::setprecision(3) << scaling;
diff --git a/src/slic3r/GUI/wxinit.h b/src/slic3r/GUI/wxinit.h
index b55681b92d..4c5ab9fb36 100644
--- a/src/slic3r/GUI/wxinit.h
+++ b/src/slic3r/GUI/wxinit.h
@@ -12,14 +12,4 @@
 // later when we no longer need to undef _
 #define __(s)                     wxGetTranslation((s))
 
-// legacy macros
-// https://wiki.wxwidgets.org/EventTypes_and_Event-Table_Macros
-#ifndef wxEVT_BUTTON
-#define wxEVT_BUTTON wxEVT_COMMAND_BUTTON_CLICKED
-#endif
-
-#ifndef wxEVT_HTML_LINK_CLICKED
-#define wxEVT_HTML_LINK_CLICKED wxEVT_COMMAND_HTML_LINK_CLICKED
-#endif
-
 #endif