diff --git a/include/d/t/d_t_defeat_boss.h b/include/d/t/d_t_defeat_boss.h
index f77af5fd..6fb783e6 100644
--- a/include/d/t/d_t_defeat_boss.h
+++ b/include/d/t/d_t_defeat_boss.h
@@ -12,7 +12,7 @@ public:
     u16 fn_494_360();
     u16 getStoryflag();
     u16 fn_494_380();
-    void fn_494_C0();
+    static void getDungeonFlagIndex(u32 &outFlagIdx);
     bool fn_494_D0();
     bool init();