diff --git a/shadowsocks-csharp/shadowsocks-csharp.csproj b/shadowsocks-csharp/shadowsocks-csharp.csproj
index d186471e..2f43d366 100644
--- a/shadowsocks-csharp/shadowsocks-csharp.csproj
+++ b/shadowsocks-csharp/shadowsocks-csharp.csproj
@@ -53,7 +53,7 @@
   <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Release|x86'">
     <OutputPath>bin\x86\Release\</OutputPath>
     <DefineConstants>TRACE</DefineConstants>
-    <Optimize>false</Optimize>
+    <Optimize>true</Optimize>
     <DebugType>pdbonly</DebugType>
     <PlatformTarget>x86</PlatformTarget>
     <ErrorReport>prompt</ErrorReport>