diff --git a/const_fmt/format_impl.h b/const_fmt/format_impl.h
index 09c4e40..425aaa1 100644
--- a/const_fmt/format_impl.h
+++ b/const_fmt/format_impl.h
@@ -10,8 +10,7 @@
  *
  */
 
-
-#include <cstdint>
+#include <stdint.h>
 
 #include "utility.h"