diff --git a/build/components/hyena.TWL/src/main.c b/build/components/hyena.TWL/src/main.c
index 98ad5bcf..44ba98ea 100644
--- a/build/components/hyena.TWL/src/main.c
+++ b/build/components/hyena.TWL/src/main.c
@@ -141,7 +141,7 @@ TwlSpMain(void)
         void *wram = OS_GetWramSubPrivArenaHi();
         void *mmem = OS_GetSubPrivArenaHi();
         OS_SetSubPrivArenaHi( (void*)SYSM_OWN_ARM7_MMEM_ADDR_END );     // メモリ配置をいじっているので、アリーナHiも変更しないとダメ！！
-        OS_SetWramSubPrivArenaHi( (void*)SYSM_OWN_ARM7_WRAM_ADDR_END );
+        OS_SetWramSubPrivArenaHi( (void*)(SYSM_OWN_ARM7_WRAM_ADDR_END - HW_FIRM_FROM_FIRM_BUF_SIZE) ); // この時点では鍵をつぶさないように
         OS_TPrintf( "MMEM SUBPRV ARENA HI : %08x -> %08x\n", mmem, OS_GetSubPrivArenaHi() );
         OS_TPrintf( "WRAM SUBPRV ARENA HI : %08x -> %08x\n", wram, OS_GetWramSubPrivArenaHi() );
     }