diff --git a/shadowsocks-csharp/Controller/Service/HttpHandler.cs b/shadowsocks-csharp/Controller/Service/HttpHandler.cs
index 36804d4..12bb486 100644
--- a/shadowsocks-csharp/Controller/Service/HttpHandler.cs
+++ b/shadowsocks-csharp/Controller/Service/HttpHandler.cs
@@ -64,7 +64,7 @@ namespace Shadowsocks.Controller.Service
             Close();
         }
 
-        private static readonly Regex HttpRequestHeaderRegex = new Regex(@"^(?<method>[A-Z]+?) (?<path>[^\s]+) (?<tail>HTTP/1\.\d)$");
+        private static readonly Regex HttpRequestHeaderRegex = new Regex(@"^(?<method>[A-Z]+?) (?<path>[^\s]+) (?<tail>HTTP/1\.\d)$", RegexOptions.Compiled);
 
         private int _requestLineCount = 0;
         private bool _isConnect = false;
diff --git a/shadowsocks-csharp/ForwardProxy/HttpProxy.cs b/shadowsocks-csharp/ForwardProxy/HttpProxy.cs
index 5fe3f82..dbc8bd7 100644
--- a/shadowsocks-csharp/ForwardProxy/HttpProxy.cs
+++ b/shadowsocks-csharp/ForwardProxy/HttpProxy.cs
@@ -165,7 +165,7 @@ namespace Shadowsocks.ForwardProxy
             st.innerState.ex = ex;
         }
 
-        private static readonly Regex HttpRespondHeaderRegex = new Regex(@"^(HTTP/1\.\d) (\d{3}) (.+)$");
+        private static readonly Regex HttpRespondHeaderRegex = new Regex(@"^(HTTP/1\.\d) (\d{3}) (.+)$", RegexOptions.Compiled);
         private int _respondLineCount = 0;
         private bool _established = false;