diff --git a/WeChatFerry/sdk/SDK.vcxproj b/WeChatFerry/sdk/SDK.vcxproj
index a796526..5c5c18a 100644
--- a/WeChatFerry/sdk/SDK.vcxproj
+++ b/WeChatFerry/sdk/SDK.vcxproj
@@ -77,6 +77,7 @@
       <ConformanceMode>true</ConformanceMode>
       <PrecompiledHeader>Use</PrecompiledHeader>
       <PrecompiledHeaderFile>pch.h</PrecompiledHeaderFile>
+      <AdditionalOptions>/utf-8 %(AdditionalOptions)</AdditionalOptions>
     </ClCompile>
     <Link>
       <SubSystem>Windows</SubSystem>
@@ -93,6 +94,7 @@
       <ConformanceMode>true</ConformanceMode>
       <PrecompiledHeader>Use</PrecompiledHeader>
       <PrecompiledHeaderFile>pch.h</PrecompiledHeaderFile>
+      <AdditionalOptions>/utf-8 %(AdditionalOptions)</AdditionalOptions>
     </ClCompile>
     <Link>
       <SubSystem>Windows</SubSystem>
diff --git a/WeChatFerry/spy/Spy.vcxproj b/WeChatFerry/spy/Spy.vcxproj
index 02a49a0..14d2b71 100644
--- a/WeChatFerry/spy/Spy.vcxproj
+++ b/WeChatFerry/spy/Spy.vcxproj
@@ -96,7 +96,7 @@
       <FunctionLevelLinking>true</FunctionLevelLinking>
       <PrecompiledHeaderOutputFile />
       <DisableSpecificWarnings>4251;4731;4819</DisableSpecificWarnings>
-      <AdditionalOptions>/EHa %(AdditionalOptions)</AdditionalOptions>
+      <AdditionalOptions>/EHa /utf-8 %(AdditionalOptions)</AdditionalOptions>
     </ClCompile>
     <Link>
       <SubSystem>Windows</SubSystem>
@@ -145,7 +145,7 @@ xcopy /y $(OutDir)$(TargetFileName) $(SolutionDir)..\clients\python\wcferry</Com
       <PrecompiledHeaderOutputFile>
       </PrecompiledHeaderOutputFile>
       <DisableSpecificWarnings>4251;4731;4819</DisableSpecificWarnings>
-      <AdditionalOptions>/EHa %(AdditionalOptions)</AdditionalOptions>
+      <AdditionalOptions>/EHa /utf-8 %(AdditionalOptions)</AdditionalOptions>
     </ClCompile>
     <Link>
       <SubSystem>Windows</SubSystem>