diff --git a/llvm/include/llvm/Support/type_traits.h b/llvm/include/llvm/Support/type_traits.h
index c8c6a76a90f1..b9d29f381873 100644
--- a/llvm/include/llvm/Support/type_traits.h
+++ b/llvm/include/llvm/Support/type_traits.h
@@ -17,11 +17,6 @@
 #include <type_traits>
 #include <utility>
 
-#ifndef __has_feature
-#define LLVM_DEFINED_HAS_FEATURE
-#define __has_feature(x) 0
-#endif
-
 namespace llvm {
 
 
@@ -203,8 +198,4 @@ class is_trivially_copyable<T*> : public std::true_type {
 #define LLVM_IS_FINAL(Ty) __is_final(Ty)
 #endif
 
-#ifdef LLVM_DEFINED_HAS_FEATURE
-#undef __has_feature
-#endif
-
 #endif // LLVM_SUPPORT_TYPE_TRAITS_H