diff --git a/tools/cabana/messageswidget.h b/tools/cabana/messageswidget.h
index d51dae4142..2452dcf212 100644
--- a/tools/cabana/messageswidget.h
+++ b/tools/cabana/messageswidget.h
@@ -1,6 +1,7 @@
 #pragma once
 
 #include <algorithm>
+#include <optional>
 #include <set>
 #include <utility>
 #include <vector>