diff --git a/include/sg14/hive.h b/include/sg14/hive.h
index 0c40b16..b8faade 100644
--- a/include/sg14/hive.h
+++ b/include/sg14/hive.h
@@ -41,6 +41,7 @@
  #define SG14_HIVE_DEBUGGING 0
 #endif
 
+#include <stddef.h>
 #include <algorithm>
 #if __has_include(<bit>)
 #include <bit>
@@ -52,7 +53,6 @@
 #if __has_include(<concepts>)
 #include <concepts>
 #endif
-#include <cstddef>
 #include <cstring>
 #include <functional>
 #include <initializer_list>
diff --git a/include/sg14/ring_span.h b/include/sg14/ring_span.h
index 1f1891e..7f07e1a 100644
--- a/include/sg14/ring_span.h
+++ b/include/sg14/ring_span.h
@@ -1,9 +1,9 @@
 #pragma once
 
-#include <cstddef>
-#include <type_traits>
-#include <iterator>
+#include <stddef.h>
 #include <cassert>
+#include <iterator>
+#include <type_traits>
 
 namespace sg14
 {