diff --git a/include/wx/html/htmlcell.h b/include/wx/html/htmlcell.h
index 3c115d554e..93d741e859 100644
--- a/include/wx/html/htmlcell.h
+++ b/include/wx/html/htmlcell.h
@@ -521,7 +521,7 @@ public:
     wxHtmlTerminalCellsInterator(const wxHtmlCell *from, const wxHtmlCell *to)
         : m_to(to), m_pos(from) {}
 
-    operator bool() const { return m_pos; }
+    operator bool() const { return m_pos != NULL; }
     const wxHtmlCell* operator++();
     const wxHtmlCell* operator->() const { return m_pos; }
     const wxHtmlCell* operator*() const { return m_pos; }