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-rw-r--r--src/Style.cxx1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/Style.cxx b/src/Style.cxx
index dfeb5f1b9..fc96cfcfd 100644
--- a/src/Style.cxx
+++ b/src/Style.cxx
@@ -8,6 +8,7 @@
#include <stdexcept>
#include <string_view>
#include <vector>
+#include <optional>
#include <memory>
#include "Debugging.h"