diff --git a/Directory.Build.props b/Directory.Build.props
index 25831091b..4f06836cb 100644
--- a/Directory.Build.props
+++ b/Directory.Build.props
@@ -1,7 +1,8 @@
 <Project>
   <PropertyGroup>
     <LangVersion>10.0</LangVersion>
-    <TargetFrameworks>netstandard2.1;net6.0;net7.0;net8.0</TargetFrameworks>
+    <DotNetTargetFrameworks>net6.0;net7.0;net8.0</DotNetTargetFrameworks>
+    <TargetFrameworks>netstandard2.1;$(DotNetTargetFrameworks)</TargetFrameworks>
     <SamplesTargetFrameworks>net8.0</SamplesTargetFrameworks>
   </PropertyGroup>
   <PropertyGroup>
diff --git a/src/SuperSocket.Kestrel/SuperSocket.Kestrel.csproj b/src/SuperSocket.Kestrel/SuperSocket.Kestrel.csproj
index 79f4e17fc..809cfb979 100644
--- a/src/SuperSocket.Kestrel/SuperSocket.Kestrel.csproj
+++ b/src/SuperSocket.Kestrel/SuperSocket.Kestrel.csproj
@@ -1,5 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
+    <TargetFrameworks>$(DotNetTargetFrameworks)</TargetFrameworks>
     <Description>SuperSocket library allows users to take advantage of Kestrel's high performance socket pipeline.</Description>
   </PropertyGroup>
   <ItemGroup>