diff --git a/src/LubanAssistant/LubanAssistant.csproj b/src/LubanAssistant/LubanAssistant.csproj
index 53539fa..7e7ebb7 100644
--- a/src/LubanAssistant/LubanAssistant.csproj
+++ b/src/LubanAssistant/LubanAssistant.csproj
@@ -98,8 +98,9 @@
     <Optimize>true</Optimize>
     <OutputPath>bin\Release\</OutputPath>
     <EnableUnmanagedDebugging>false</EnableUnmanagedDebugging>
-    <DefineConstants>$(DefineConstants);TRACE</DefineConstants>
+    <DefineConstants>TRACE;VSTO40,LUBAN_LITE</DefineConstants>
     <WarningLevel>4</WarningLevel>
+    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
   </PropertyGroup>
   <!--
     This section specifies references for the project.