diff --git a/desmume/src/slot2.h b/desmume/src/slot2.h
index ca263bb5f..2908bca9b 100644
--- a/desmume/src/slot2.h
+++ b/desmume/src/slot2.h
@@ -16,7 +16,7 @@
 */
 
 #ifndef __SLOT2_H__
-#define __SLOT_H__
+#define __SLOT2_H__
 
 #include "common.h"
 #include "types.h"