diff --git a/common/chat-handler.hpp b/common/chat-handler.hpp
index 2ba85893c..e640112a2 100644
--- a/common/chat-handler.hpp
+++ b/common/chat-handler.hpp
@@ -10,6 +10,7 @@
 
 #include "common.h"
 #include <json.hpp>
+#include <optional>
 #include <string>
 #include <vector>