diff --git a/include/Support/DataTypes.h b/include/Support/DataTypes.h
index 4904bb31daa..a93919d0f68 100644
--- a/include/Support/DataTypes.h
+++ b/include/Support/DataTypes.h
@@ -11,7 +11,6 @@
 // This file is important because different host OS's define different macros,
 // which makes portability tough.  This file exports the following definitions:
 //
-//   ENDIAN_LITTLE : is #define'd if the host is little endian
 //   int64_t       : is a typedef for the signed 64 bit system type
 //   uint64_t      : is a typedef for the unsigned 64 bit system type
 //   INT64_MAX     : is a #define specifying the max value for int64_t's
@@ -42,14 +41,6 @@
 #include <sys/types.h>
 #endif
 
-#if (defined(ENDIAN_LITTLE) && defined(ENDIAN_BIG))
-#error "Cannot define both ENDIAN_LITTLE and ENDIAN_BIG!"
-#endif
-
-#if (!defined(ENDIAN_LITTLE) && !defined(ENDIAN_BIG))
-#error "include/Support/DataTypes.h could not determine endianness!"
-#endif
-
 #if !defined(INT64_MAX)
 /* We couldn't determine INT64_MAX; default it. */
 #define INT64_MAX 9223372036854775807LL