--- a/saveload.c	Tue Jul 19 11:42:40 2005 +0000
+++ b/saveload.c	Tue Jul 19 11:55:47 2005 +0000
@@ -905,6 +905,7 @@
 //********************************************
 
 #if defined(WITH_ZLIB)
+#define ZLIB_WINAPI // Needed so zlib uses the right calling convention.
 #include <zlib.h>
 static z_stream _z;