Index: test/profile/Inputs/instrprof-merge-match.c
===================================================================
--- test/profile/Inputs/instrprof-merge-match.c
+++ test/profile/Inputs/instrprof-merge-match.c
@@ -1,6 +1,7 @@
 #include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
+#include "../profile_test.h"
 
 int __llvm_profile_runtime = 0;
 uint64_t __llvm_profile_get_size_for_buffer(void);
@@ -20,7 +21,7 @@
 
 int main(int argc, const char *argv[]) {
   const uint64_t MaxSize = 10000;
-  static char Buffer[MaxSize];
+  static char ALIGNED(sizeof(uint64_t)) Buffer[MaxSize];
 
   uint64_t Size = __llvm_profile_get_size_for_buffer();
   if (Size > MaxSize)
Index: test/profile/instrprof-merge.c
===================================================================
--- test/profile/instrprof-merge.c
+++ test/profile/instrprof-merge.c
@@ -8,6 +8,7 @@
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include "profile_test.h"
 
 int __llvm_profile_runtime = 0;
 uint64_t __llvm_profile_get_size_for_buffer(void);
@@ -41,7 +42,7 @@
     return 1;
 
   const uint64_t MaxSize = 10000;
-  static char Buffer[MaxSize];
+  static ALIGNED(sizeof(uint64_t)) char Buffer[MaxSize];
 
   uint64_t Size = __llvm_profile_get_size_for_buffer();
   if (Size > MaxSize)
Index: test/profile/profile_test.h
===================================================================
--- /dev/null
+++ test/profile/profile_test.h
@@ -0,0 +1,20 @@
+//===-- profile_test.h.h ----------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains definitions for the profile tests.
+//===----------------------------------------------------------------------===//
+#ifndef PROFILE_TEST_H
+#define PROFILE_TEST_H
+
+#if defined(_MSC_VER)
+# define ALIGNED(x) __declspec(align(x))
+#else  // _MSC_VER
+# define ALIGNED(x) __attribute__((aligned(x)))
+#endif
+
+#endif  // PROFILE_TEST_H