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-rw-r--r--src/ContractionState.cxx1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/ContractionState.cxx b/src/ContractionState.cxx
index 57d9b7a1c..06b3b573d 100644
--- a/src/ContractionState.cxx
+++ b/src/ContractionState.cxx
@@ -10,6 +10,7 @@
#include <cstring>
#include <stdexcept>
+#include <string_view>
#include <vector>
#include <algorithm>
#include <memory>