diff --git a/libcxx/test/std/numerics/bit/bit.pow.two/bit_ceil.fail.cpp b/libcxx/test/std/numerics/bit/bit.pow.two/bit_ceil.fail.cpp
--- a/libcxx/test/std/numerics/bit/bit.pow.two/bit_ceil.fail.cpp
+++ b/libcxx/test/std/numerics/bit/bit.pow.two/bit_ceil.fail.cpp
@@ -15,9 +15,10 @@
 //          T is an unsigned integer type
 
 #include <bit>
+#include <cassert>
+#include <cstddef>
 #include <cstdint>
 #include <limits>
-#include <cassert>
 
 #include "test_macros.h"