diff --git a/include/openmc/version.h.in b/include/openmc/version.h.in
index 79e7f34bb..48c4f8c08 100644
--- a/include/openmc/version.h.in
+++ b/include/openmc/version.h.in
@@ -1,3 +1,4 @@
+#include <array>
 
 namespace openmc {
 
@@ -8,4 +9,4 @@ namespace openmc {
   constexpr bool VERSION_DEV {true};
   constexpr std::array<int, 3> VERSION {VERSION_MAJOR, VERSION_MINOR, VERSION_RELEASE};
 
-}
\ No newline at end of file
+}