diff --git a/include/wx/xti.h b/include/wx/xti.h
index 4a82a413be..4080092cb8 100644
--- a/include/wx/xti.h
+++ b/include/wx/xti.h
@@ -424,7 +424,7 @@ public :
 	wxxVariant( wxxVariantData* data , const wxString& name = wxT("") ) : m_data(data) , m_name(name) {}
 	wxxVariant( const wxxVariant &d ) { if ( d.m_data ) m_data = d.m_data->Clone() ; else m_data = NULL ; m_name = d.m_name ; }
 
-	template<typename T> wxxVariant( T data , const wxString& name = wxT("") ) :
+	template<typename T> wxxVariant( const T& data , const wxString& name = wxT("") ) :
 		m_data(new wxxVariantDataT<T>(data) ), m_name(name) {}
 
 	~wxxVariant() { delete m_data ; }