diff --git a/src/libutil/util.cc b/src/libutil/util.cc
index d1270cd31..72405ac83 100644
--- a/src/libutil/util.cc
+++ b/src/libutil/util.cc
@@ -4,6 +4,7 @@
 #include "finally.hh"
 #include "serialise.hh"
 
+#include <array>
 #include <cctype>
 #include <cerrno>
 #include <climits>