diff --git a/UnitTests/UnitTests.vcxproj b/UnitTests/UnitTests.vcxproj
index 3bd737b38..0b8b298a2 100644
--- a/UnitTests/UnitTests.vcxproj
+++ b/UnitTests/UnitTests.vcxproj
@@ -128,6 +128,7 @@
     <ClCompile Include="unicode.cpp" />
   </ItemGroup>
   <ItemGroup>
+    <ClInclude Include="compat.hpp" />
     <ClInclude Include="pch.h" />
   </ItemGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
diff --git a/UnitTests/UnitTests.vcxproj.filters b/UnitTests/UnitTests.vcxproj.filters
index 09af76837..083565803 100644
--- a/UnitTests/UnitTests.vcxproj.filters
+++ b/UnitTests/UnitTests.vcxproj.filters
@@ -41,5 +41,8 @@
     <ClInclude Include="pch.h">
       <Filter>Header Files</Filter>
     </ClInclude>
+    <ClInclude Include="compat.hpp">
+      <Filter>Header Files</Filter>
+    </ClInclude>
   </ItemGroup>
 </Project>
\ No newline at end of file
diff --git a/UnitTests/stream.cpp b/UnitTests/stream.cpp
index 31c880411..2fcd6599f 100644
--- a/UnitTests/stream.cpp
+++ b/UnitTests/stream.cpp
@@ -112,7 +112,7 @@ namespace UnitTests
 			sstring filename[count];
 			stdex::stream::fpos_t start[count];
 			for (uint32_t i = 0; i < count; ++i) {
-				filename[i] = filepath + sprintf(_T("stdex-stream-open_close%zu.tmp"), NULL, i);
+				filename[i] = filepath + sprintf(_T("stdex-stream-open_close%u.tmp"), NULL, i);
 				dat.open(filename[i].c_str(), mode_for_reading | mode_for_writing | share_none | mode_preserve_existing | mode_binary);
 				Assert::IsTrue(dat.ok());
 				start[i] = dat.tell();
diff --git a/include/stdex/endian.hpp b/include/stdex/endian.hpp
index c7edd0d55..61751f7c5 100644
--- a/include/stdex/endian.hpp
+++ b/include/stdex/endian.hpp
@@ -101,8 +101,18 @@ namespace stdex
 	inline int16_t byteswap(_In_ const int16_t value) { return byteswap(static_cast<uint16_t>(value)); }
 	inline int32_t byteswap(_In_ const int32_t value) { return byteswap(static_cast<uint32_t>(value)); }
 	inline int64_t byteswap(_In_ const int64_t value) { return byteswap(static_cast<uint64_t>(value)); }
-	inline float byteswap(_In_ const float value) { return byteswap(*reinterpret_cast<const uint32_t*>(&value)); }
-	inline double byteswap(_In_ const double value) { return byteswap(*reinterpret_cast<const uint64_t*>(&value)); }
+
+	inline float byteswap(_In_ const float value)
+	{
+		uint32_t r = byteswap(*reinterpret_cast<const uint32_t*>(&value));
+		return *reinterpret_cast<float*>(&r);
+	}
+
+	inline double byteswap(_In_ const double value)
+	{
+		uint64_t r = byteswap(*reinterpret_cast<const uint64_t*>(&value));
+		return *reinterpret_cast<double*>(&r);
+	}
 
 	inline void byteswap(_Inout_ uint8_t* value) { assert(value); *value = byteswap(*value); }
 	inline void byteswap(_Inout_ uint16_t* value) { assert(value); *value = byteswap(*value); }