diff --git a/Fwk/AppFwk/cafProjectDataModel/cafPdmUiCore/cafPdmUi3dObjectEditorHandle.h b/Fwk/AppFwk/cafProjectDataModel/cafPdmUiCore/cafPdmUi3dObjectEditorHandle.h
index 1a6a2ba15b..2c387321fb 100644
--- a/Fwk/AppFwk/cafProjectDataModel/cafPdmUiCore/cafPdmUi3dObjectEditorHandle.h
+++ b/Fwk/AppFwk/cafProjectDataModel/cafPdmUiCore/cafPdmUi3dObjectEditorHandle.h
@@ -78,7 +78,7 @@ public:
     void setViewer(QWidget* ownerViewer);
 
 protected:
-    QWidget* ownerViewer() { return m_ownerViewer;}
+    QWidget* ownerViewer() const { return m_ownerViewer;}
 
 private: