Explicitly specify alignment of 64-bit types.
diff --git a/include/winnt.h b/include/winnt.h
index 3316608..067fd29 100644
--- a/include/winnt.h
+++ b/include/winnt.h
@@ -319,13 +319,13 @@
/* 'Extended/Wide' numerical types */
#ifndef _ULONGLONG_
#define _ULONGLONG_
-typedef signed __int64 LONGLONG, *PLONGLONG;
-typedef unsigned __int64 ULONGLONG, *PULONGLONG;
+typedef signed __int64 DECLSPEC_ALIGN(8) LONGLONG, *PLONGLONG;
+typedef unsigned __int64 DECLSPEC_ALIGN(8) ULONGLONG, *PULONGLONG;
#endif
#ifndef _DWORDLONG_
#define _DWORDLONG_
-typedef ULONGLONG DWORDLONG, *PDWORDLONG;
+typedef ULONGLONG DECLSPEC_ALIGN(8) DWORDLONG, *PDWORDLONG;
#endif
/* ANSI string types */