diff --git a/src/client_main.cpp b/src/client_main.cpp
index dd17be077ed7a42d52a3a18003a110660ac1ac76..1b2516f50b689c10f240bf672b95c53d38fdfb79 100644
--- a/src/client_main.cpp
+++ b/src/client_main.cpp
@@ -1,6 +1,5 @@
 #include "client.hpp"
 #include "definitions.hpp"
-#include "util.h"
 #include "util.hpp"
 #include "wordle-de.pb.h"
 #include <cstdio>
diff --git a/wordle-de.proto b/wordle-de.proto
index c90ada1e140085da5b5d90b5b8448a0e7cba9fd9..829a901ceef92f432d8494d2147bdaeb31f53b89 100644
--- a/wordle-de.proto
+++ b/wordle-de.proto
@@ -9,7 +9,7 @@ message Login {
 
 message LoginAck {
   bool loggedIn = 1;
-  optional string error = 2;
+  string error = 2;
 }
 
 message Guess {