diff --git a/src/RestSharp/RestClient.cs b/src/RestSharp/RestClient.cs
index b80a616ea..d53096fa7 100644
--- a/src/RestSharp/RestClient.cs
+++ b/src/RestSharp/RestClient.cs
@@ -126,6 +126,7 @@ public RestClient(HttpMessageHandler handler, bool disposeHandler = true) : this
     void ConfigureHttpClient(HttpClient httpClient) {
         if (Options.Timeout > 0) httpClient.Timeout = TimeSpan.FromMilliseconds(Options.Timeout);
         httpClient.DefaultRequestHeaders.UserAgent.ParseAdd(Options.UserAgent);
+        httpClient.DefaultRequestHeaders.ExpectContinue = Options.Expect100Continue;
     }
 
     void ConfigureHttpMessageHandler(HttpClientHandler handler) {
diff --git a/src/RestSharp/RestClientOptions.cs b/src/RestSharp/RestClientOptions.cs
index 5df868323..7c6e9d500 100644
--- a/src/RestSharp/RestClientOptions.cs
+++ b/src/RestSharp/RestClientOptions.cs
@@ -73,6 +73,7 @@ public RestClientOptions(string baseUrl) : this(new Uri(Ensure.NotEmptyString(ba
     public IWebProxy?               Proxy           { get; set; }
     public CacheControlHeaderValue? CachePolicy     { get; set; }
     public bool                     FollowRedirects { get; set; } = true;
+    public bool?                    Expect100Continue { get; set; } = null;
     public CookieContainer?         CookieContainer { get; set; }
     public string                   UserAgent       { get; set; } = DefaultUserAgent;
     public int                      Timeout         { get; set; }