diff --git a/websocket-sharp/AuthenticationResponse.cs b/websocket-sharp/Net/AuthenticationResponse.cs
similarity index 99%
rename from websocket-sharp/AuthenticationResponse.cs
rename to websocket-sharp/Net/AuthenticationResponse.cs
index 6e0f94e7..54df3991 100644
--- a/websocket-sharp/AuthenticationResponse.cs
+++ b/websocket-sharp/Net/AuthenticationResponse.cs
@@ -35,9 +35,8 @@ using System.Collections.Specialized;
 using System.Security.Cryptography;
 using System.Security.Principal;
 using System.Text;
-using WebSocketSharp.Net;
 
-namespace WebSocketSharp
+namespace WebSocketSharp.Net
 {
   internal class AuthenticationResponse
   {
diff --git a/websocket-sharp/websocket-sharp.csproj b/websocket-sharp/websocket-sharp.csproj
index bcd95cca..8751548c 100644
--- a/websocket-sharp/websocket-sharp.csproj
+++ b/websocket-sharp/websocket-sharp.csproj
@@ -110,7 +110,6 @@
     <Compile Include="Net\HttpHeaderInfo.cs" />
     <Compile Include="CompressionMethod.cs" />
     <Compile Include="WebSocketException.cs" />
-    <Compile Include="AuthenticationResponse.cs" />
     <Compile Include="LogData.cs" />
     <Compile Include="LogLevel.cs" />
     <Compile Include="Logger.cs" />
@@ -135,6 +134,7 @@
     <Compile Include="Net\QueryStringCollection.cs" />
     <Compile Include="WebSocketFrame.cs" />
     <Compile Include="Net\AuthenticationChallenge.cs" />
+    <Compile Include="Net\AuthenticationResponse.cs" />
   </ItemGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
   <ItemGroup>