diff --git a/include/wx/msw/window.h b/include/wx/msw/window.h
index e946446c55..52bdd1eeb2 100644
--- a/include/wx/msw/window.h
+++ b/include/wx/msw/window.h
@@ -428,7 +428,7 @@ public:
                                int themePart,
                                int themeState,
                                MSWThemeColour themeColour,
-                               wxSystemColour fallback);
+                               wxSystemColour fallback) const;
 
     // gives the parent the possibility to draw its children background, e.g.
     // this is used by wxNotebook to do it using DrawThemeBackground()
diff --git a/src/msw/window.cpp b/src/msw/window.cpp
index 67d6be5c16..81b6b93e5b 100644
--- a/src/msw/window.cpp
+++ b/src/msw/window.cpp
@@ -4739,7 +4739,7 @@ wxColour wxWindowMSW::MSWGetThemeColour(const wchar_t *themeName,
                                         int themePart,
                                         int themeState,
                                         MSWThemeColour themeColour,
-                                        wxSystemColour fallback)
+                                        wxSystemColour fallback) const
 {
 #if wxUSE_UXTHEME
     const wxUxThemeEngine* theme = wxUxThemeEngine::GetIfActive();
@@ -4763,7 +4763,7 @@ wxColour wxWindowMSW::MSWGetThemeColour(const wchar_t *themeName,
                 wxFAIL_MSG(wxT("unsupported theme colour"));
         };
 
-        wxUxThemeHandle hTheme((wxWindow *)this, themeName);
+        wxUxThemeHandle hTheme((const wxWindow *)this, themeName);
         COLORREF col;
         HRESULT hr = theme->GetThemeColor
                             (