diff --git a/include/nana/gui/widgets/treebox.hpp b/include/nana/gui/widgets/treebox.hpp
index a5235880..9d8f9828 100644
--- a/include/nana/gui/widgets/treebox.hpp
+++ b/include/nana/gui/widgets/treebox.hpp
@@ -411,8 +411,6 @@ namespace nana
 		/// Determinte whether the checkbox is enabled.
 		bool checkable() const;
 
-		treebox& icon(const nana::string& id, const node_image_type& node_img);
-
 		node_image_type& icon(const nana::string& id) const;
 
 		void icon_erase(const nana::string& id);