diff --git a/llvm/unittests/Support/ConvertUTFTest.cpp b/llvm/unittests/Support/ConvertUTFTest.cpp
--- a/llvm/unittests/Support/ConvertUTFTest.cpp
+++ b/llvm/unittests/Support/ConvertUTFTest.cpp
@@ -16,7 +16,7 @@
 
 TEST(ConvertUTFTest, ConvertUTF16LittleEndianToUTF8String) {
   // Src is the look of disapproval.
-  static const char Src[] = "\xff\xfe\xa0\x0c_\x00\xa0\x0c";
+  static const char Src[] __attribute__((aligned (sizeof(UTF16)))) = "\xff\xfe\xa0\x0c_\x00\xa0\x0c";
   ArrayRef<char> Ref(Src, sizeof(Src) - 1);
   std::string Result;
   bool Success = convertUTF16ToUTF8String(Ref, Result);
@@ -27,7 +27,7 @@
 
 TEST(ConvertUTFTest, ConvertUTF16BigEndianToUTF8String) {
   // Src is the look of disapproval.
-  static const char Src[] = "\xfe\xff\x0c\xa0\x00_\x0c\xa0";
+  static const char Src[] __attribute__((aligned (sizeof(UTF16)))) = "\xfe\xff\x0c\xa0\x00_\x0c\xa0";
   ArrayRef<char> Ref(Src, sizeof(Src) - 1);
   std::string Result;
   bool Success = convertUTF16ToUTF8String(Ref, Result);