diff --git a/test/base-utility.cpp b/test/base-utility.cpp
index eb59bf3f9..1da0a623b 100644
--- a/test/base-utility.cpp
+++ b/test/base-utility.cpp
@@ -7,7 +7,6 @@
 #ifdef _WIN32
 # include <windows.h>
 # include <shellapi.h>
-# include <atlstr.h>
 #endif /* _WIN32 */
 
 using namespace icinga;
@@ -84,6 +83,8 @@ BOOST_AUTO_TEST_CASE(validateutf8)
 BOOST_AUTO_TEST_CASE(EscapeCreateProcessArg)
 {
 #ifdef _WIN32
+	using convert = std::wstring_convert<std::codecvt<wchar_t, char, std::mbstate_t>, wchar_t>;
+
 	std::vector<std::string> testdata = {
 		R"(foobar)",
 		R"(foo bar)",
@@ -98,11 +99,11 @@ BOOST_AUTO_TEST_CASE(EscapeCreateProcessArg)
 		// Prepend some fake exec name as the first argument is handled differently.
 		std::string escaped = "some.exe " + Utility::EscapeCreateProcessArg(t);
 		int argc;
-		std::shared_ptr<LPWSTR> argv(CommandLineToArgvW(CA2W(escaped.c_str()), &argc), LocalFree);
+		std::shared_ptr<LPWSTR> argv(CommandLineToArgvW(convert{}.from_bytes(escaped.c_str()).data(), &argc), LocalFree);
 		BOOST_CHECK_MESSAGE(argv != nullptr, "CommandLineToArgvW() should not return nullptr for " << t);
 		BOOST_CHECK_MESSAGE(argc == 2, "CommandLineToArgvW() should find 2 arguments for " << t);
 		if (argc >= 2) {
-			std::string unescaped = CW2A(argv.get()[1]);
+			std::string unescaped = convert{}.to_bytes(argv.get()[1]);
 			BOOST_CHECK_MESSAGE(unescaped == t,
 				"CommandLineToArgvW() should return original value for " << t << " (got: " << unescaped << ")");
 		}