diff --git a/include/wx/msw/stdpaths.h b/include/wx/msw/stdpaths.h
index 3f733bc67f..154ab40e97 100644
--- a/include/wx/msw/stdpaths.h
+++ b/include/wx/msw/stdpaths.h
@@ -30,7 +30,8 @@ public:
     virtual wxString GetPluginsDir() const wxOVERRIDE;
     virtual wxString GetUserDir(Dir userDir) const wxOVERRIDE;
     virtual wxString MakeConfigFileName(const wxString& basename,
-                                        ConfigFileConv conv) const wxOVERRIDE;
+                                        ConfigFileConv conv = ConfigFileConv_Ext
+                                        ) const wxOVERRIDE;
 
 
     // MSW-specific methods
diff --git a/include/wx/osx/cocoa/stdpaths.h b/include/wx/osx/cocoa/stdpaths.h
index c77713da12..1500c88dc9 100644
--- a/include/wx/osx/cocoa/stdpaths.h
+++ b/include/wx/osx/cocoa/stdpaths.h
@@ -33,7 +33,8 @@ public:
                              ResourceCat category = ResourceCat_None) const wxOVERRIDE;
     virtual wxString GetUserDir(Dir userDir) const wxOVERRIDE;
     virtual wxString MakeConfigFileName(const wxString& basename,
-                                        ConfigFileConv conv) const wxOVERRIDE;
+                                        ConfigFileConv conv = ConfigFileConv_Ext
+                                        ) const wxOVERRIDE;
 
 protected:
     // Ctor is protected, use wxStandardPaths::Get() instead of instantiating
diff --git a/include/wx/stdpaths.h b/include/wx/stdpaths.h
index bbb5b72dcd..e7ce24bec4 100644
--- a/include/wx/stdpaths.h
+++ b/include/wx/stdpaths.h
@@ -252,9 +252,12 @@ public:
     virtual wxString GetUserDataDir() const { return m_prefix; }
     virtual wxString GetPluginsDir() const { return m_prefix; }
     virtual wxString GetUserDir(Dir WXUNUSED(userDir)) const { return m_prefix; }
-    virtual wxString MakeConfigFileName(const wxString& basename,
-                                        ConfigFileConv WXUNUSED(conv)) const
-                         { return m_prefix + wxS("/") + basename; }
+    virtual wxString
+    MakeConfigFileName(const wxString& basename,
+                       ConfigFileConv WXUNUSED(conv) = ConfigFileConv_Ext) const
+    {
+        return m_prefix + wxS("/") + basename;
+    }
 
 protected:
     // Ctor is protected because wxStandardPaths::Get() should always be used
diff --git a/include/wx/unix/stdpaths.h b/include/wx/unix/stdpaths.h
index e67d9c6ea2..c6400326d4 100644
--- a/include/wx/unix/stdpaths.h
+++ b/include/wx/unix/stdpaths.h
@@ -50,7 +50,8 @@ public:
     virtual wxString GetUserDir(Dir userDir) const wxOVERRIDE;
 #endif
     virtual wxString MakeConfigFileName(const wxString& basename,
-                                        ConfigFileConv conv) const wxOVERRIDE;
+                                        ConfigFileConv conv = ConfigFileConv_Ext
+                                        ) const wxOVERRIDE;
 
 protected:
     // Ctor is protected, use wxStandardPaths::Get() instead of instantiating