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-rw-r--r--test/unit/testCharClassify.cxx1
1 files changed, 1 insertions, 0 deletions
diff --git a/test/unit/testCharClassify.cxx b/test/unit/testCharClassify.cxx
index 82d2f2a45..c44a7e973 100644
--- a/test/unit/testCharClassify.cxx
+++ b/test/unit/testCharClassify.cxx
@@ -4,6 +4,7 @@
#include <string_view>
#include <vector>
+#include <optional>
#include <algorithm>
#include <memory>
#include <iostream>