diff --git a/include/array_view.h b/include/array_view.h
index 3502076..c884c11 100644
--- a/include/array_view.h
+++ b/include/array_view.h
@@ -24,6 +24,7 @@
 #include <cstddef>
 #include <cstdint>
 #include <limits>
+#include <numeric>
 #include <type_traits>
 #include <utility>
 #include <array>