diff --git a/win32/include/stdarg.h b/win32/include/stdarg.h
index a9b22b7b..31c15095 100644
--- a/win32/include/stdarg.h
+++ b/win32/include/stdarg.h
@@ -1,7 +1,10 @@
 #ifndef _STDARG_H
 #define _STDARG_H
 
+#ifndef _VA_LIST
+#define _VA_LIST
 typedef char *va_list;
+#endif
 
 /* only correct for i386 */
 #define va_start(ap,last) ap = ((char *)&(last)) + ((sizeof(last)+3)&~3)