diff --git a/include/script.h b/include/script.h
index 15020fc19..9d33e2b9f 100644
--- a/include/script.h
+++ b/include/script.h
@@ -98,6 +98,7 @@ typedef enum ScriptEnvField {
     SCRIPTENV_MISC_DATA_PTR,
     SCRIPTENV_UNKNOWN_21,
     SCRIPTENV_UNKNOWN_22,
+    SCRIPTENV_BATTLE_WIN_FLAG,
 } ScriptEnvField;
 
 #define ScriptReadByte(ctx) (*(ctx->scriptPtr++))