diff --git a/src/SocksSharp/Proxy/Request/RequestBuilder.cs b/src/SocksSharp/Proxy/Request/RequestBuilder.cs
index e4a2d5d..26abf8c 100644
--- a/src/SocksSharp/Proxy/Request/RequestBuilder.cs
+++ b/src/SocksSharp/Proxy/Request/RequestBuilder.cs
@@ -46,7 +46,14 @@ public byte[] BuildHeaders(bool hasContent)
             if (hasContent)
             {
                 var contentHeaders = GetHeaders(request.Content.Headers);
-                headers = String.Join(newLine, headers, contentHeaders);
+                if (!string.IsNullOrEmpty(headers))
+                {
+                    headers = string.Join(newLine, headers, contentHeaders);
+                }
+                else
+                {
+                    headers = contentHeaders;
+                }
             }
 
             return ToByteArray(headers + newLine + newLine);