diff --git a/src/Microsoft.Data.SqlClient/netfx/src/Microsoft/Data/SqlClient/TdsParser.cs b/src/Microsoft.Data.SqlClient/netfx/src/Microsoft/Data/SqlClient/TdsParser.cs
index 664c6e56d5..af7a8c40d2 100644
--- a/src/Microsoft.Data.SqlClient/netfx/src/Microsoft/Data/SqlClient/TdsParser.cs
+++ b/src/Microsoft.Data.SqlClient/netfx/src/Microsoft/Data/SqlClient/TdsParser.cs
@@ -682,7 +682,7 @@ internal void Connect(ServerInfo serverInfo,
             if (!ClientOSEncryptionSupport)
             {
                 //If encryption is required, an error will be thrown.
-                if (encrypt == SqlConnectionEncryptOption.Mandatory)
+                if (encrypt != SqlConnectionEncryptOption.Optional)
                 {
                     _physicalStateObj.AddError(new SqlError(TdsEnums.ENCRYPTION_NOT_SUPPORTED, (byte)0x00, TdsEnums.FATAL_ERROR_CLASS, _server, SQLMessage.EncryptionNotSupportedByClient(), "", 0));
                     _physicalStateObj.Dispose();