WIN32 -> _WIN32; see http://predef.sourceforge.net/preos.html#sec25
diff --git a/skeletons/asn_system.h b/skeletons/asn_system.h
index 0a9b092..d391b7b 100644
--- a/skeletons/asn_system.h
+++ b/skeletons/asn_system.h
@@ -21,7 +21,7 @@
#include <stdarg.h> /* For va_start */
#include <stddef.h> /* for offsetof and ptrdiff_t */
-#ifdef WIN32
+#ifdef _WIN32
#include <malloc.h>
#define snprintf _snprintf
@@ -46,7 +46,7 @@
typedef unsigned short uint16_t;
typedef unsigned int uint32_t;
#endif /* ASSUMESTDTYPES */
-#define WIN32_LEAN_AND_MEAN
+#define _WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <float.h>
#define isnan _isnan
@@ -57,7 +57,7 @@
#include <stdint.h>
#endif /* _MSC_VER */
-#else /* !WIN32 */
+#else /* !_WIN32 */
#if defined(__vxworks)
#include <types/vxTypes.h>
@@ -90,7 +90,7 @@
#endif /* defined(__vxworks) */
-#endif /* WIN32 */
+#endif /* _WIN32 */
#if __GNUC__ >= 3
#ifndef GCC_PRINTFLIKE