diff --git a/IotaCSharpApi/Api/Utils/Rest/JsonWebClient.cs b/IotaCSharpApi/Api/Utils/Rest/JsonWebClient.cs
index 800b281..2a82ba8 100644
--- a/IotaCSharpApi/Api/Utils/Rest/JsonWebClient.cs
+++ b/IotaCSharpApi/Api/Utils/Rest/JsonWebClient.cs
@@ -33,7 +33,7 @@ public TResponse GetPOSTResponseSync<TResponse>(Uri uri, string data)
 
             request.ContentLength = bytes.Length;
 
-            Stream requestStream = request.GetRequestStream();
+            using (Stream requestStream = request.GetRequestStream())
             {
                 // Send the data.
                 requestStream.Write(bytes, 0, bytes.Length);