diff --git a/msvc/libusb_dll_2015.vcxproj b/msvc/libusb_dll_2015.vcxproj
index ce562f1..e5a19fd 100644
--- a/msvc/libusb_dll_2015.vcxproj
+++ b/msvc/libusb_dll_2015.vcxproj
@@ -53,10 +53,18 @@
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
       <Optimization>Disabled</Optimization>
       <RuntimeLibrary>MultiThreadedDebugDLL</RuntimeLibrary>
+      <AdditionalOptions Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">/source-charset:utf-8 %(AdditionalOptions)</AdditionalOptions>
+      <AdditionalOptions Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">/source-charset:utf-8 %(AdditionalOptions)</AdditionalOptions>
+      <AdditionalOptions Condition="'$(Configuration)|$(Platform)'=='Release|x64'">/source-charset:utf-8 %(AdditionalOptions)</AdditionalOptions>
+      <AdditionalOptions Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">/source-charset:utf-8 %(AdditionalOptions)</AdditionalOptions>
     </ClCompile>
     <ClCompile Condition="'$(Configuration)'=='Release'">
       <PreprocessorDefinitions>NDEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <RuntimeLibrary>MultiThreadedDLL</RuntimeLibrary>
+      <AdditionalOptions Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">/source-charset:utf-8 %(AdditionalOptions)</AdditionalOptions>
+      <AdditionalOptions Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">/source-charset:utf-8 %(AdditionalOptions)</AdditionalOptions>
+      <AdditionalOptions Condition="'$(Configuration)|$(Platform)'=='Release|x64'">/source-charset:utf-8 %(AdditionalOptions)</AdditionalOptions>
+      <AdditionalOptions Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">/source-charset:utf-8 %(AdditionalOptions)</AdditionalOptions>
     </ClCompile>
     <Link>
       <EmbedManagedResourceFile>libusb-1.0.rc;%(EmbedManagedResourceFile)</EmbedManagedResourceFile>
diff --git a/msvc/libusb_dll_2017.vcxproj b/msvc/libusb_dll_2017.vcxproj
index 8311300..f635aed 100644
--- a/msvc/libusb_dll_2017.vcxproj
+++ b/msvc/libusb_dll_2017.vcxproj
@@ -53,10 +53,18 @@
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
       <Optimization>Disabled</Optimization>
       <RuntimeLibrary>MultiThreadedDebugDLL</RuntimeLibrary>
+      <AdditionalOptions Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">/source-charset:utf-8 %(AdditionalOptions)</AdditionalOptions>
+      <AdditionalOptions Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">/source-charset:utf-8 %(AdditionalOptions)</AdditionalOptions>
+      <AdditionalOptions Condition="'$(Configuration)|$(Platform)'=='Release|x64'">/source-charset:utf-8 %(AdditionalOptions)</AdditionalOptions>
+      <AdditionalOptions Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">/source-charset:utf-8 %(AdditionalOptions)</AdditionalOptions>
     </ClCompile>
     <ClCompile Condition="'$(Configuration)'=='Release'">
       <PreprocessorDefinitions>NDEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <RuntimeLibrary>MultiThreadedDLL</RuntimeLibrary>
+      <AdditionalOptions Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">/source-charset:utf-8 %(AdditionalOptions)</AdditionalOptions>
+      <AdditionalOptions Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">/source-charset:utf-8 %(AdditionalOptions)</AdditionalOptions>
+      <AdditionalOptions Condition="'$(Configuration)|$(Platform)'=='Release|x64'">/source-charset:utf-8 %(AdditionalOptions)</AdditionalOptions>
+      <AdditionalOptions Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">/source-charset:utf-8 %(AdditionalOptions)</AdditionalOptions>
     </ClCompile>
     <Link>
       <EmbedManagedResourceFile>libusb-1.0.rc;%(EmbedManagedResourceFile)</EmbedManagedResourceFile>
diff --git a/msvc/libusb_static_2015.vcxproj b/msvc/libusb_static_2015.vcxproj
index a182171..ce4cc66 100644
--- a/msvc/libusb_static_2015.vcxproj
+++ b/msvc/libusb_static_2015.vcxproj
@@ -54,10 +54,18 @@
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
       <Optimization>Disabled</Optimization>
       <RuntimeLibrary>MultiThreadedDebug</RuntimeLibrary>
+      <AdditionalOptions Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">/source-charset:utf-8 %(AdditionalOptions)</AdditionalOptions>
+      <AdditionalOptions Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">/source-charset:utf-8 %(AdditionalOptions)</AdditionalOptions>
+      <AdditionalOptions Condition="'$(Configuration)|$(Platform)'=='Release|x64'">/source-charset:utf-8 %(AdditionalOptions)</AdditionalOptions>
+      <AdditionalOptions Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">/source-charset:utf-8 %(AdditionalOptions)</AdditionalOptions>
     </ClCompile>
     <ClCompile Condition="'$(Configuration)'=='Release'">
       <PreprocessorDefinitions>NDEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
+      <AdditionalOptions Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">/source-charset:utf-8 %(AdditionalOptions)</AdditionalOptions>
+      <AdditionalOptions Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">/source-charset:utf-8 %(AdditionalOptions)</AdditionalOptions>
+      <AdditionalOptions Condition="'$(Configuration)|$(Platform)'=='Release|x64'">/source-charset:utf-8 %(AdditionalOptions)</AdditionalOptions>
+      <AdditionalOptions Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">/source-charset:utf-8 %(AdditionalOptions)</AdditionalOptions>
     </ClCompile>
     <Lib>
       <OutputFile>$(OutDir)libusb-1.0.lib</OutputFile>
diff --git a/msvc/libusb_static_2017.vcxproj b/msvc/libusb_static_2017.vcxproj
index 1341693..8908450 100644
--- a/msvc/libusb_static_2017.vcxproj
+++ b/msvc/libusb_static_2017.vcxproj
@@ -54,10 +54,18 @@
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
       <Optimization>Disabled</Optimization>
       <RuntimeLibrary>MultiThreadedDebug</RuntimeLibrary>
+      <AdditionalOptions Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">/source-charset:utf-8 %(AdditionalOptions)</AdditionalOptions>
+      <AdditionalOptions Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">/source-charset:utf-8 %(AdditionalOptions)</AdditionalOptions>
+      <AdditionalOptions Condition="'$(Configuration)|$(Platform)'=='Release|x64'">/source-charset:utf-8 %(AdditionalOptions)</AdditionalOptions>
+      <AdditionalOptions Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">/source-charset:utf-8 %(AdditionalOptions)</AdditionalOptions>
     </ClCompile>
     <ClCompile Condition="'$(Configuration)'=='Release'">
       <PreprocessorDefinitions>NDEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
+      <AdditionalOptions Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">/source-charset:utf-8 %(AdditionalOptions)</AdditionalOptions>
+      <AdditionalOptions Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">/source-charset:utf-8 %(AdditionalOptions)</AdditionalOptions>
+      <AdditionalOptions Condition="'$(Configuration)|$(Platform)'=='Release|x64'">/source-charset:utf-8 %(AdditionalOptions)</AdditionalOptions>
+      <AdditionalOptions Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">/source-charset:utf-8 %(AdditionalOptions)</AdditionalOptions>
     </ClCompile>
     <Lib>
       <OutputFile>$(OutDir)libusb-1.0.lib</OutputFile>