diff --git a/src/DialogHelper.cpp b/src/DialogHelper.cpp
index b481e60..e789fd0 100644
--- a/src/DialogHelper.cpp
+++ b/src/DialogHelper.cpp
@@ -161,7 +161,7 @@ namespace YYCC::DialogHelper {
 
 	bool ExtractDisplayName(IShellItem* item, std::string& ret) {
 		// fetch display name from IShellItem*
-		WCHAR* _name;
+		LPWSTR _name;
 		HRESULT hr = item->GetDisplayName(SIGDN_FILESYSPATH, &_name);
 		if (FAILED(hr)) return false;
 		SmartLPWSTR display_name(_name);
diff --git a/src/DialogHelper.hpp b/src/DialogHelper.hpp
index 109e4bc..6255930 100644
--- a/src/DialogHelper.hpp
+++ b/src/DialogHelper.hpp
@@ -32,18 +32,17 @@ namespace YYCC::DialogHelper {
 	using SmartIShellItemArray = std::unique_ptr<IShellItemArray, ComPtrDeleter>;
 	using SmartIShellFolder = std::unique_ptr<IShellFolder, ComPtrDeleter>;
 
-	template<typename _Ty>
 	class CoTaskMemDeleter {
 	public:
 		CoTaskMemDeleter() {}
-		void operator() (_Ty* com_ptr) {
+		void operator() (void* com_ptr) {
 			if (com_ptr != nullptr) {
 				CoTaskMemFree(com_ptr);
 			}
 		}
 	};
 
-	using SmartLPWSTR = std::unique_ptr<WCHAR, CoTaskMemDeleter<WCHAR>>;
+	using SmartLPWSTR = std::unique_ptr<std::remove_pointer_t<LPWSTR>, CoTaskMemDeleter>;
 
 #pragma endregion