diff --git a/dxlibex/basic_types/bel.hpp b/dxlibex/basic_types/bel.hpp
index 63a342f..571cfa3 100644
--- a/dxlibex/basic_types/bel.hpp
+++ b/dxlibex/basic_types/bel.hpp
@@ -114,14 +114,24 @@ namespace dxle {
 	using namespace sound_units;
 }
 #ifdef DXLE_SUPPORT_CXX11_USER_DEFINED_LITERALS
+#if !defined(_MSC_VER) || defined(__clang__)
 namespace dxle { namespace sound_units { namespace sound_units_literals {
-	inline constexpr myrio_bel operator "" _myrioB(unsigned long long myrioB) {
+#else
+#	define myrio_bel dxle::myrio_bel
+#	define deci_bel dxle::deci_bel
+#endif
+	inline DXLE_CONSTEXPR myrio_bel operator "" _myrioB(unsigned long long myrioB) {
 		return myrio_bel(static_cast<int>(myrioB));
 	}
-	inline constexpr myrio_bel operator "" _dB(unsigned long long myrioB) {
+	inline DXLE_CONSTEXPR deci_bel operator "" _dB(unsigned long long myrioB) {
 		return deci_bel(static_cast<int>(myrioB));
 	}
+#if !defined(_MSC_VER) || defined(__clang__)
 } } }
 using namespace dxle::sound_units::sound_units_literals;
+#else
+#	undef myrio_bel
+#	undef deci_bel
+#endif
 #endif
 #endif //DXLE_INC_BASIC_TYPES_BEL_HPP_
diff --git a/samples/sound_play/sound_play/main.cpp b/samples/sound_play/sound_play/main.cpp
index f8d90d0..93b2472 100644
--- a/samples/sound_play/sound_play/main.cpp
+++ b/samples/sound_play/sound_play/main.cpp
@@ -6,4 +6,5 @@ int WINAPI WinMain(HINSTANCE /*hInstance*/, HINSTANCE /*hPrevInstance*/, LPSTR /
 	constexpr auto rate = 300_dB;
 	constexpr auto rate2 = 4000_myrioB;
 	constexpr auto rate3 = dxle::bel_cast<dxle::bel>(rate);
+	constexpr dxle::deci_bel rate4(100);
 }