diff --git a/contrib/minizip/ioapi.h b/contrib/minizip/ioapi.h
index da1b72f..f3b193d 100644
--- a/contrib/minizip/ioapi.h
+++ b/contrib/minizip/ioapi.h
@@ -18,8 +18,8 @@
 
 */
 
-#ifndef _ZLIBIOAPI64_H
-#define _ZLIBIOAPI64_H
+#ifndef ZLIBIOAPI64_H
+#define ZLIBIOAPI64_H
 
 #if (!defined(_WIN32)) && (!defined(WIN32)) && (!defined(__APPLE__))