diff --git a/Code/Wrappers/QtWidget/otbWrapperQtWidgetParameterBase.h b/Code/Wrappers/QtWidget/otbWrapperQtWidgetParameterBase.h
index e184e4895566da4d3a02466496306bfcbae48ae0..fcea90caf533c860362f5ffc8fd9f2c795c2ba05 100644
--- a/Code/Wrappers/QtWidget/otbWrapperQtWidgetParameterBase.h
+++ b/Code/Wrappers/QtWidget/otbWrapperQtWidgetParameterBase.h
@@ -38,6 +38,8 @@ public:
   virtual ~QtWidgetParameterBase();
 
   void CreateWidget();
+
+public slots:
   void UpdateGUI();
 
 protected slots: