diff --git a/include/delaunator.hpp b/include/delaunator.hpp
index 6bc5221..89d6e54 100644
--- a/include/delaunator.hpp
+++ b/include/delaunator.hpp
@@ -8,6 +8,7 @@
 #include <memory>
 #include <utility>
 #include <vector>
+#include <tuple>
 
 namespace delaunator {