diff --git a/source/audio/detail/buffer_preparation.cpp b/source/audio/detail/buffer_preparation.cpp
index 82942846..febe3a77 100644
--- a/source/audio/detail/buffer_preparation.cpp
+++ b/source/audio/detail/buffer_preparation.cpp
@@ -78,7 +78,7 @@ namespace nana{	namespace audio
 			void buffer_preparation::revert(meta * m)
 			{
 				std::lock_guard<decltype(token_prepared_)> lock(token_prepared_);
-				bool if_signal = prepared_.empty();
+				auto const if_signal = prepared_.empty();
 				prepared_.emplace_back(m);
 				if(if_signal)
 					cond_prepared_.notify_one();
diff --git a/source/gui/widgets/menubar.cpp b/source/gui/widgets/menubar.cpp
index a14db116..a83c3d86 100644
--- a/source/gui/widgets/menubar.cpp
+++ b/source/gui/widgets/menubar.cpp
@@ -169,7 +169,7 @@ namespace nana
 				}
 
 
-				std::size_t find(unsigned long shortkey) const
+				std::size_t find(wchar_t shortkey) const
 				{
 					if (shortkey)
 					{
@@ -262,7 +262,7 @@ namespace nana
 					return *ess_;
 				}
 
-				void trigger::attached(widget_reference widget, graph_reference graph)
+				void trigger::attached(widget_reference widget, graph_reference)
 				{
 					ess_->widget_ptr = &widget;
 				}
diff --git a/source/gui/widgets/progress.cpp b/source/gui/widgets/progress.cpp
index 5e66334b..20b46ddc 100644
--- a/source/gui/widgets/progress.cpp
+++ b/source/gui/widgets/progress.cpp
@@ -136,10 +136,8 @@ namespace nana
 			{	
 				const unsigned border_px = substance::border_px;
 
-				unsigned width = graph.width() - border_px * 2;
-				unsigned height = graph.height() - border_px * 2;
-
 				rectangle rt_val{ graph.size() };
+				auto const width = rt_val.width - border_px * 2;
 
 				rt_val.pare_off(static_cast<int>(border_px));