diff --git a/win32/include/_mingw.h b/win32/include/_mingw.h
index 1e06f23c..77a3bce6 100644
--- a/win32/include/_mingw.h
+++ b/win32/include/_mingw.h
@@ -70,9 +70,13 @@
 
 #ifdef _WIN64
 #define __stdcall
-#if defined(__aarch64__)
+#if defined(__aarch64__) || defined(_M_ARM64) || defined(_ARM64_)
+#ifndef _M_ARM64
 #define _M_ARM64 1
+#endif
+#ifndef _ARM64_
 #define _ARM64_ 1
+#endif
 #else
 #define _AMD64_ 1
 #define __x86_64 1