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-rw-r--r--src/Indicator.cxx1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/Indicator.cxx b/src/Indicator.cxx
index 007f30f77..9a182469d 100644
--- a/src/Indicator.cxx
+++ b/src/Indicator.cxx
@@ -11,6 +11,7 @@
#include <string_view>
#include <vector>
#include <map>
+#include <optional>
#include <algorithm>
#include <memory>