diff --git a/fmt/format.h b/fmt/format.h
index 10ae61bd..f1194e06 100644
--- a/fmt/format.h
+++ b/fmt/format.h
@@ -28,6 +28,7 @@
 #ifndef FMT_FORMAT_H_
 #define FMT_FORMAT_H_
 
+#include <array>
 #include <cassert>
 #include <clocale>
 #include <cmath>