diff --git a/websocket-sharp/WebSocket.cs b/websocket-sharp/WebSocket.cs
index c8595a58..6e307cb7 100644
--- a/websocket-sharp/WebSocket.cs
+++ b/websocket-sharp/WebSocket.cs
@@ -3403,8 +3403,10 @@ namespace WebSocketSharp
         throw new ArgumentNullException ("data");
 
       byte[] bytes;
-      if (!data.TryGetUTF8EncodedBytes (out bytes))
-        throw new ArgumentException ("It could not be UTF-8-encoded.", "data");
+      if (!data.TryGetUTF8EncodedBytes (out bytes)) {
+        var msg = "It could not be UTF-8-encoded.";
+        throw new ArgumentException (msg, "data");
+      }
 
       sendAsync (Opcode.Text, new MemoryStream (bytes), completed);
     }