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-rw-r--r--src/mame/includes/osi.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/src/mame/includes/osi.h b/src/mame/includes/osi.h
index 485204bf31c..e9037eef9ad 100644
--- a/src/mame/includes/osi.h
+++ b/src/mame/includes/osi.h
@@ -2,8 +2,8 @@
// copyright-holders:Curt Coder, Robbbert, Wilbert Pol
#pragma once
-#ifndef __OSI__
-#define __OSI__
+#ifndef MAME_INCLUDES_OSI_H
+#define MAME_INCLUDES_OSI_H
#include "cpu/m6502/m6502.h"