diff --git a/source/gui/notifier.cpp b/source/gui/notifier.cpp
index ddecc68d..7db75217 100644
--- a/source/gui/notifier.cpp
+++ b/source/gui/notifier.cpp
@@ -331,6 +331,8 @@ namespace nana
 			impl_->set_icon(image_ico);
 			impl_->icon = image_ico;
 		}
+#else
+		static_cast<void>(icon_file);	//eliminate unused parameter warning
 #endif
 	}
 
@@ -341,6 +343,8 @@ namespace nana
 		auto icon_handle = paint::image_accessor::icon(image_ico);
 		if (icon_handle)
 			impl_->icons.emplace_back(static_cast<paint::image&&>(image_ico));
+#else
+		static_cast<void>(icon_file);	//eliminate unused parameter warning
 #endif
 	}
 
diff --git a/source/gui/place.cpp b/source/gui/place.cpp
index b1d26889..30053a00 100644
--- a/source/gui/place.cpp
+++ b/source/gui/place.cpp
@@ -472,8 +472,6 @@ namespace nana
 		if (depth < 0 || start_pos >= div.length())
 			return{};
 
-		const char* p = div.c_str() + start_pos;
-
 		while (depth >= 0)
 		{
 			auto pos = div.find_last_of("<>", start_pos);
diff --git a/source/paint/detail/image_ico_ex.hpp b/source/paint/detail/image_ico_ex.hpp
index 33f1d96c..9beef0c8 100644
--- a/source/paint/detail/image_ico_ex.hpp
+++ b/source/paint/detail/image_ico_ex.hpp
@@ -57,7 +57,7 @@ typedef struct
 class image_ico_ex
 	: public basic_image_pixbuf
 {
-	bool _m_read_ico(const void* data, std::size_t size)
+	bool _m_read_ico(const void* data, std::size_t /*size*/)
 	{
 		auto width = 0;
 		auto height = 0;
@@ -94,7 +94,7 @@ class image_ico_ex
 		cursor += offset;
 		auto icon = reinterpret_cast<ICONIMAGE*>(cursor);
 		auto realBitsCount = static_cast<int>(icon->icHeader.biBitCount);
-		auto hasAndMask = (realBitsCount < 32) && (height != icon->icHeader.biHeight);
+		auto hasAndMask = (realBitsCount < 32) && (height != static_cast<int>(icon->icHeader.biHeight));
 		cursor += 40;
 		pixbuf_.open(width, height);
 
@@ -259,4 +259,4 @@ public:
 }//end namespace paint
 }//end namespace nana
 
-#endif
\ No newline at end of file
+#endif
diff --git a/source/paint/image.cpp b/source/paint/image.cpp
index 65ad6ba2..6875a198 100644
--- a/source/paint/image.cpp
+++ b/source/paint/image.cpp
@@ -363,8 +363,9 @@ namespace paint
 						if (!ptr && bytes > 40 /* sizeof(BITMAPINFOHEADER) */ && (40 == *reinterpret_cast<const uint32_t*>(data))) {
 							ptr = std::make_shared<detail::image_ico>(true);
 						}
+						else
 #endif
-						else if (!ptr && bytes > 40 && (0x00010000 == *reinterpret_cast<const unsigned*>(data)))
+						if (!ptr && bytes > 40 && (0x00010000 == *reinterpret_cast<const unsigned*>(data)))
 							ptr = std::make_shared<detail::image_ico_ex>();
 					}
 				}