Index: test/std/containers/sequences/array/array.data/data.pass.cpp
===================================================================
--- test/std/containers/sequences/array/array.data/data.pass.cpp
+++ test/std/containers/sequences/array/array.data/data.pass.cpp
@@ -13,6 +13,8 @@
 
 #include <array>
 #include <cassert>
+#include <cstddef>       // for std::max_align_t
+
 #include "test_macros.h"
 
 // std::array is explicitly allowed to be initialized with A a = { init-list };.
Index: test/std/containers/sequences/array/array.data/data_const.pass.cpp
===================================================================
--- test/std/containers/sequences/array/array.data/data_const.pass.cpp
+++ test/std/containers/sequences/array/array.data/data_const.pass.cpp
@@ -13,6 +13,7 @@
 
 #include <array>
 #include <cassert>
+#include <cstddef>       // for std::max_align_t
 
 #include "test_macros.h"
 
Index: test/std/utilities/memory/default.allocator/allocator.members/allocate.pass.cpp
===================================================================
--- test/std/utilities/memory/default.allocator/allocator.members/allocate.pass.cpp
+++ test/std/utilities/memory/default.allocator/allocator.members/allocate.pass.cpp
@@ -14,6 +14,7 @@
 
 #include <memory>
 #include <cassert>
+#include <cstddef>       // for std::max_align_t
 #include <iostream>
 
 #include "test_macros.h"