diff --git a/dxlibex/basic_types/bel.hpp b/dxlibex/basic_types/bel.hpp
index 571cfa3..b2a7b78 100644
--- a/dxlibex/basic_types/bel.hpp
+++ b/dxlibex/basic_types/bel.hpp
@@ -114,24 +114,14 @@ 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 {
-#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 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/dxlibex/config/compiler/visualc.hpp b/dxlibex/config/compiler/visualc.hpp
index e693fd4..a70f966 100644
--- a/dxlibex/config/compiler/visualc.hpp
+++ b/dxlibex/config/compiler/visualc.hpp
@@ -32,5 +32,8 @@
 #ifndef __cpp_user_defined_literals
 #define DXLE_NO_CXX11_USER_DEFINED_LITERALS
 #endif
+#if _MSC_VER == 1900
+#undef DXLE_NO_CXX11_USER_DEFINED_LITERALS
+#endif
 
 #endif	// #ifndef DXLE_INC_CONFIG_COMPILER_VISUALC_HPP_
diff --git a/samples/sound_play/sound_play/main.cpp b/samples/sound_play/sound_play/main.cpp
index 93b2472..7b1d90b 100644
--- a/samples/sound_play/sound_play/main.cpp
+++ b/samples/sound_play/sound_play/main.cpp
@@ -3,8 +3,10 @@
 #include <Windows.h>
 int WINAPI WinMain(HINSTANCE /*hInstance*/, HINSTANCE /*hPrevInstance*/, LPSTR /*lpCmdLine*/, int /*nCmdShow*/) {
 	//SetCreateSoundPitchRate(100);
+#ifdef DXLE_SUPPORT_CXX11_USER_DEFINED_LITERALS
 	constexpr auto rate = 300_dB;
 	constexpr auto rate2 = 4000_myrioB;
 	constexpr auto rate3 = dxle::bel_cast<dxle::bel>(rate);
+#endif
 	constexpr dxle::deci_bel rate4(100);
 }