diff --git a/include/llvm/Support/Compiler.h b/include/llvm/Support/Compiler.h
index c9cc3da8c3f..0df154b5d6d 100644
--- a/include/llvm/Support/Compiler.h
+++ b/include/llvm/Support/Compiler.h
@@ -133,11 +133,6 @@
  || (__GNUC__ == 4 && __GNUC_MINOR__ >= 5)
 # define LLVM_BUILTIN_UNREACHABLE __builtin_unreachable()
 #else
-#ifdef __cplusplus
-extern "C" LLVM_ATTRIBUTE_NORETURN void abort() throw();
-#else
-extern LLVM_ATTRIBUTE_NORETURN void abort();
-#endif
 # define LLVM_BUILTIN_UNREACHABLE abort()
 #endif