diff --git a/include/wx/generic/richmsgdlgg.h b/include/wx/generic/richmsgdlgg.h
index 5446f87fef..9384dbb882 100644
--- a/include/wx/generic/richmsgdlgg.h
+++ b/include/wx/generic/richmsgdlgg.h
@@ -20,8 +20,8 @@ class WXDLLIMPEXP_CORE wxGenericRichMessageDialog
 public:
     wxGenericRichMessageDialog(wxWindow *parent,
                                const wxString& message,
-                               const wxString& caption,
-                               long style)
+                               const wxString& caption = wxMessageBoxCaptionStr,
+                               long style = wxOK | wxCENTRE)
         : wxRichMessageDialogBase( parent, message, caption, style ),
           m_checkBox(NULL),
           m_detailsPane(NULL)
diff --git a/include/wx/msw/richmsgdlg.h b/include/wx/msw/richmsgdlg.h
index 20c8eb72da..51cdc63222 100644
--- a/include/wx/msw/richmsgdlg.h
+++ b/include/wx/msw/richmsgdlg.h
@@ -15,8 +15,8 @@ class WXDLLIMPEXP_CORE wxRichMessageDialog : public wxGenericRichMessageDialog
 public:
     wxRichMessageDialog(wxWindow *parent,
                         const wxString& message,
-                        const wxString& caption,
-                        long style)
+                        const wxString& caption = wxMessageBoxCaptionStr,
+                        long style = wxOK | wxCENTRE)
         : wxGenericRichMessageDialog(parent, message, caption, style)
         { }
 
diff --git a/include/wx/richmsgdlg.h b/include/wx/richmsgdlg.h
index 1fbc96428f..ab49af7d00 100644
--- a/include/wx/richmsgdlg.h
+++ b/include/wx/richmsgdlg.h
@@ -73,8 +73,8 @@ private:
     public:
         wxRichMessageDialog( wxWindow *parent,
                              const wxString& message,
-                             const wxString& caption,
-                             long style )
+                             const wxString& caption = wxMessageBoxCaptionStr,
+                             long style = wxOK | wxCENTRE )
             : wxGenericRichMessageDialog( parent, message, caption, style )
             { }