diff --git a/include/llvm/System/DataTypes.h.in b/include/llvm/System/DataTypes.h.in
index d5749104caa..1f8ce79f4eb 100644
--- a/include/llvm/System/DataTypes.h.in
+++ b/include/llvm/System/DataTypes.h.in
@@ -36,8 +36,6 @@
 #include <math.h>
 #endif
 
-#ifndef _MSC_VER
-
 /* Note that this header's correct operation depends on __STDC_LIMIT_MACROS
    being defined.  We would define it here, but in order to prevent Bad Things
    happening when system headers or C++ STL headers include stdint.h before we
@@ -89,40 +87,6 @@ typedef u_int64_t uint64_t;
 #define UINT32_MAX 4294967295U
 #endif
 
-#else /* _MSC_VER */
-/* Visual C++ doesn't provide standard integer headers, but it does provide
-   built-in data types. */
-#include <stdlib.h>
-#include <stddef.h>
-#include <sys/types.h>
-typedef __int64 int64_t;
-typedef unsigned __int64 uint64_t;
-typedef signed int int32_t;
-typedef unsigned int uint32_t;
-typedef short int16_t;
-typedef unsigned short uint16_t;
-typedef signed char int8_t;
-typedef unsigned char uint8_t;
-typedef signed int ssize_t;
-#define INT8_MAX 127
-#define INT8_MIN -128
-#define UINT8_MAX 255
-#define INT16_MAX 32767
-#define INT16_MIN -32768
-#define UINT16_MAX 65535
-#define INT32_MAX 2147483647
-#define INT32_MIN -2147483648
-#define UINT32_MAX 4294967295U
-#define INT8_C(C)   C
-#define UINT8_C(C)  C
-#define INT16_C(C)  C
-#define UINT16_C(C) C
-#define INT32_C(C)  C
-#define UINT32_C(C) C ## U
-#define INT64_C(C)  ((int64_t) C ## LL)
-#define UINT64_C(C) ((uint64_t) C ## ULL)
-#endif /* _MSC_VER */
-
 /* Set defaults for constants which we cannot find. */
 #if !defined(INT64_MAX)
 # define INT64_MAX 9223372036854775807LL