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diff --git a/src/ob/lispp.hh b/src/ob/lispp.hh
index e00560638ba6..432539bac132 100644
--- a/src/ob/lispp.hh
+++ b/src/ob/lispp.hh
@@ -72,6 +72,7 @@ SOFTWARE.
#include <iterator>
#include <algorithm>
#include <filesystem>
+#include <optional>
#include <functional>
#include <string_view>
#include <type_traits>
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