diff --git a/include/nana/gui/detail/window_manager.hpp b/include/nana/gui/detail/window_manager.hpp
index c8229df6..b04c32dc 100644
--- a/include/nana/gui/detail/window_manager.hpp
+++ b/include/nana/gui/detail/window_manager.hpp
@@ -106,7 +106,7 @@ namespace detail
 		//@brief:	Delete window handle, the handle type must be a root and a frame.
 		void destroy_handle(core_window_t*);
 
-		void default_icon(const paint::image& small_icon, const paint::image& big_icon);
+		void default_icon(const paint::image& _small_icon, const paint::image& big_icon);
 		void icon(core_window_t*, const paint::image& small_icon, const paint::image& big_icon);
 
 		//show
diff --git a/source/gui/detail/window_manager.cpp b/source/gui/detail/window_manager.cpp
index eb56ff89..909cf193 100644
--- a/source/gui/detail/window_manager.cpp
+++ b/source/gui/detail/window_manager.cpp
@@ -463,10 +463,10 @@ namespace detail
 			}
 		}
 
-		void window_manager::default_icon(const nana::paint::image& small, const nana::paint::image& big)
+		void window_manager::default_icon(const nana::paint::image& _small, const nana::paint::image& big)
 		{
 			impl_->default_icon_big = big;
-			impl_->default_icon_small = small;
+			impl_->default_icon_small = _small;
 		}
 
 		void window_manager::icon(core_window_t* wd, const paint::image& small_icon, const paint::image& big_icon)