diff --git a/lib/libc/tests/net/link_addr_test.cc b/lib/libc/tests/net/link_addr_test.cc
--- a/lib/libc/tests/net/link_addr_test.cc
+++ b/lib/libc/tests/net/link_addr_test.cc
@@ -21,7 +21,6 @@
 
 #include <sys/types.h>
 #include <sys/socket.h>
-#include <sys/stddef.h>
 #include <net/ethernet.h>
 #include <net/if_dl.h>
 
@@ -31,6 +30,7 @@
 #include <utility>
 #include <ranges>
 #include <cstdint>
+#include <cstddef>
 
 #include <atf-c++.hpp>