diff --git a/include/chat/config.h b/include/chat/config.h
index fa417b8..77d8d37 100644
--- a/include/chat/config.h
+++ b/include/chat/config.h
@@ -28,6 +28,7 @@ extern "C" {
 #define WHY2_CHAT_CODE_PICK_USERNAME "code_001"
 #define WHY2_CHAT_CODE_SERVER_SIDE_QUIT_COMMUNICATION "code_002"
 #define WHY2_CHAT_CODE_INVALID_COMMAND "code_003"
+#define WHY2_CHAT_CODE_INVALID_USERNAME "code_004"
 
 //SHORTCUTS CAUSE I'M LAZY BITCH
 #define WHY2_CHAT_CODE_SSQC WHY2_CHAT_CODE_SERVER_SIDE_QUIT_COMMUNICATION