diff --git a/include/llvm/Support/Host.h b/include/llvm/Support/Host.h
index a916f8a6d2b..103a7eb0367 100644
--- a/include/llvm/Support/Host.h
+++ b/include/llvm/Support/Host.h
@@ -19,7 +19,7 @@
 #if defined(__linux__)
 #include <endian.h>
 #else
-#ifndef _MSC_VER
+#ifndef LLVM_ON_WIN32
 #include <machine/endian.h>
 #endif
 #endif