diff --git a/src/Titanium.Web.Proxy/Http/Request.cs b/src/Titanium.Web.Proxy/Http/Request.cs
index dbbfa7025..a17847625 100644
--- a/src/Titanium.Web.Proxy/Http/Request.cs
+++ b/src/Titanium.Web.Proxy/Http/Request.cs
@@ -110,6 +110,7 @@ public string RequestUriString
                 {
                     var uri = new Uri(value);
                     Host = uri.Authority;
+                    Authority = ByteString.Empty;
                 }
             }
         }