diff --git a/include/windef.h b/include/windef.h
index 5a8fa100c37..9b60b436772 100644
--- a/include/windef.h
+++ b/include/windef.h
@@ -41,6 +41,10 @@ extern "C" {
 # define _X86_
 #endif
 
+#if defined(_X86_) && !defined(__i386__)
+# define __i386__
+#endif
+
 #ifdef __x86_64__
 #define _WIN64
 #endif
@@ -126,6 +130,10 @@ extern "C" {
 # endif
 #endif
 
+#ifdef _MSC_VER
+# define inline __inline
+#endif
+
 #define CALLBACK    __stdcall
 #define WINAPI      __stdcall
 #define APIPRIVATE  __stdcall