diff --git a/include/boost/charconv/to_chars.hpp b/include/boost/charconv/to_chars.hpp
index 404fe44..f1d58d5 100644
--- a/include/boost/charconv/to_chars.hpp
+++ b/include/boost/charconv/to_chars.hpp
@@ -18,6 +18,7 @@
 #include <cstdio>
 #include <cerrno>
 #include <cstdint>
+#include <climits>
 
 namespace boost { namespace charconv {