diff --git a/websocket-sharp/Net/CookieException.cs b/websocket-sharp/Net/CookieException.cs
index 54b44b85..be1349ea 100644
--- a/websocket-sharp/Net/CookieException.cs
+++ b/websocket-sharp/Net/CookieException.cs
@@ -137,12 +137,16 @@ namespace WebSocketSharp.Net
     /// <param name="streamingContext">
     /// A <see cref="StreamingContext"/> that specifies the destination for the serialization.
     /// </param>
-    [SecurityPermission (
-      SecurityAction.LinkDemand,
-      Flags = SecurityPermissionFlag.SerializationFormatter,
-      SerializationFormatter = true)]
+    [
+      SecurityPermission (
+        SecurityAction.LinkDemand,
+        Flags = SecurityPermissionFlag.SerializationFormatter,
+        SerializationFormatter = true
+      )
+    ]
     void ISerializable.GetObjectData (
-      SerializationInfo serializationInfo, StreamingContext streamingContext)
+      SerializationInfo serializationInfo, StreamingContext streamingContext
+    )
     {
       base.GetObjectData (serializationInfo, streamingContext);
     }