diff --git a/test/minigzip.c b/test/minigzip.c
index 541f3716b..201d00519 100644
--- a/test/minigzip.c
+++ b/test/minigzip.c
@@ -40,7 +40,7 @@
 #  include <sys/stat.h>
 #endif
 
-#if defined(MSDOS) || defined(OS2) || defined(WIN32) || defined(__CYGWIN__)
+#if defined(MSDOS) || defined(OS2) || defined(_WIN32) || defined(__CYGWIN__)
 #  include <fcntl.h>
 #  include <io.h>
 #  ifdef UNDER_CE
@@ -67,7 +67,7 @@
 #endif
 
 #if !defined(Z_HAVE_UNISTD_H) && !defined(_LARGEFILE64_SOURCE)
-#ifndef WIN32 /* unlink already in stdio.h for WIN32 */
+#ifndef _WIN32 /* unlink already in stdio.h for _WIN32 */
   extern int unlink(const char *);
 #endif
 #endif