diff --git a/ExchangeSharp/API/Common/BaseAPI.cs b/ExchangeSharp/API/Common/BaseAPI.cs
index e47cc2f0..c183b6ab 100644
--- a/ExchangeSharp/API/Common/BaseAPI.cs
+++ b/ExchangeSharp/API/Common/BaseAPI.cs
@@ -264,11 +264,11 @@ static BaseAPI()
 
 #if HAS_WINDOWS_FORMS // NET47
 
-                ServicePointManager.SecurityProtocol = SecurityProtocolType.SystemDefault | SecurityProtocolType.Ssl3 | SecurityProtocolType.Tls | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls12;
+                ServicePointManager.SecurityProtocol = SecurityProtocolType.SystemDefault | SecurityProtocolType.Tls | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls12;
 
 #else
 
-                ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 | SecurityProtocolType.Ssl3;
+                ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
 
 #endif