diff --git a/src/Titanium.Web.Proxy/EventArguments/SessionEventArgsBase.cs b/src/Titanium.Web.Proxy/EventArguments/SessionEventArgsBase.cs
index 07fc38536..f9e3ecc2b 100644
--- a/src/Titanium.Web.Proxy/EventArguments/SessionEventArgsBase.cs
+++ b/src/Titanium.Web.Proxy/EventArguments/SessionEventArgsBase.cs
@@ -84,7 +84,7 @@ public bool EnableWinAuth
             get => enableWinAuth;
             set
             {
-                if (!isWindowsAuthenticationSupported)
+                if (value && !isWindowsAuthenticationSupported)
                     throw new Exception("Windows Authentication is not supported");
 
                 enableWinAuth = value;