diff --git a/include/wx/wizard.h b/include/wx/wizard.h
index ee19faee0f..ec311b7cb9 100644
--- a/include/wx/wizard.h
+++ b/include/wx/wizard.h
@@ -123,7 +123,8 @@ public:
                             int id = -1,
                             const wxString& title = wxEmptyString,
                             const wxBitmap& bitmap = wxNullBitmap,
-                            const wxPoint& pos = wxDefaultPosition);
+                            const wxPoint& pos = wxDefaultPosition,
+                            const wxSize& size = wxDefaultSize);
 
     // executes the wizard starting from the given page, returns TRUE if it was
     // successfully finished, FALSE if user cancelled it
diff --git a/src/generic/wizard.cpp b/src/generic/wizard.cpp
index 58f7ecc2fc..89a309e9e4 100644
--- a/src/generic/wizard.cpp
+++ b/src/generic/wizard.cpp
@@ -367,9 +367,9 @@ wxWizard *wxWizardBase::Create(wxWindow *parent,
                                const wxString& title,
                                const wxBitmap& bitmap,
                                const wxPoint& pos,
-                               const wxSize& size)
+                               const wxSize& WXUNUSED(size))
 {
-    return new wxWizard(parent, id, title, bitmap, pos, size);
+    return new wxWizard(parent, id, title, bitmap, pos);
 }
 
 // ----------------------------------------------------------------------------