diff --git a/include/battle.h b/include/battle.h
index 25964e3f6..741e821e9 100644
--- a/include/battle.h
+++ b/include/battle.h
@@ -1,4 +1,4 @@
-#include GUARD_BATTLE_H
+#ifndef GUARD_BATTLE_H
 #define GUARD_BATTLE_H
 
 #define BATTLE_TYPE_DOUBLE          0x0001