diff --git a/src/proto/FunctionRpc.proto b/src/proto/FunctionRpc.proto
index b9c9237..2c9393f 100644
--- a/src/proto/FunctionRpc.proto
+++ b/src/proto/FunctionRpc.proto
@@ -558,11 +558,11 @@ message RpcException {
 
   // Worker specifies whether exception is a user exception, 
   // for purpose of application insights logging. Defaults to false. 
-  optional bool is_user_exception = 4;
+  bool is_user_exception = 4;
 
   // Type of exception. If it's a user exception, the type is passed along to app insights.
   // Otherwise, it's ignored for now.
-  optional string type = 5; 
+  string type = 5; 
 }
 
 // Http cookie type. Note that only name and value are used for Http requests
@@ -620,4 +620,4 @@ message RpcHttp {
   map<string,NullableString> nullable_headers = 20;
   map<string,NullableString> nullable_params = 21;
   map<string,NullableString> nullable_query = 22;
-}
\ No newline at end of file
+}