diff --git a/lib/Support/MD5.cpp b/lib/Support/MD5.cpp
index 4c72cef..8f18068 100644
--- a/lib/Support/MD5.cpp
+++ b/lib/Support/MD5.cpp
@@ -183,7 +183,7 @@
     : a(0x67452301), b(0xefcdab89), c(0x98badcfe), d(0x10325476), hi(0), lo(0) {
 }
 
-/// Incrementally add the bytes in Data to the hash.
+/// Incrementally add the bytes in \p Data to the hash.
 void MD5::update(ArrayRef<uint8_t> Data) {
   MD5_u32plus saved_lo;
   unsigned long used, free;
diff --git a/unittests/Support/MD5Test.cpp b/unittests/Support/MD5Test.cpp
index 6afaa15..c5658ec 100644
--- a/unittests/Support/MD5Test.cpp
+++ b/unittests/Support/MD5Test.cpp
@@ -20,7 +20,7 @@
 
 namespace {
 /// \brief Tests an arbitrary set of bytes passed as \p Input.
-void TestMD5Sum(ArrayRef<unsigned char> Input, StringRef Final) {
+void TestMD5Sum(ArrayRef<uint8_t> Input, StringRef Final) {
   MD5 Hash;
   Hash.update(Input);
   MD5::MD5Result MD5Res;
@@ -31,20 +31,20 @@
 }
 
 TEST(MD5Test, MD5) {
-  TestMD5Sum(ArrayRef<unsigned char>((const unsigned char *)"", (size_t) 0),
+  TestMD5Sum(ArrayRef<uint8_t>((const uint8_t *)"", (size_t) 0),
              "d41d8cd98f00b204e9800998ecf8427e");
-  TestMD5Sum(ArrayRef<unsigned char>((const unsigned char *)"a", (size_t) 1),
+  TestMD5Sum(ArrayRef<uint8_t>((const uint8_t *)"a", (size_t) 1),
              "0cc175b9c0f1b6a831c399e269772661");
-  TestMD5Sum(ArrayRef<unsigned char>(
-                 (const unsigned char *)"abcdefghijklmnopqrstuvwxyz",
+  TestMD5Sum(ArrayRef<uint8_t>(
+                 (const uint8_t *)"abcdefghijklmnopqrstuvwxyz",
                  (size_t) 26),
              "c3fcd3d76192e4007dfb496cca67e13b");
-  TestMD5Sum(ArrayRef<unsigned char>((const unsigned char *)"\0", (size_t) 1),
+  TestMD5Sum(ArrayRef<uint8_t>((const uint8_t *)"\0", (size_t) 1),
              "93b885adfe0da089cdf634904fd59f71");
-  TestMD5Sum(ArrayRef<unsigned char>((const unsigned char *)"a\0", (size_t) 2),
+  TestMD5Sum(ArrayRef<uint8_t>((const uint8_t *)"a\0", (size_t) 2),
              "4144e195f46de78a3623da7364d04f11");
-  TestMD5Sum(ArrayRef<unsigned char>(
-                 (const unsigned char *)"abcdefghijklmnopqrstuvwxyz\0",
+  TestMD5Sum(ArrayRef<uint8_t>(
+                 (const uint8_t *)"abcdefghijklmnopqrstuvwxyz\0",
                  (size_t) 27),
              "81948d1f1554f58cd1a56ebb01f808cb");
 }