diff --git a/backend/api/core/RedisPreheat.py b/backend/api/core/RedisPreheat.py
index d8ee16a2..4faf2f3a 100644
--- a/backend/api/core/RedisPreheat.py
+++ b/backend/api/core/RedisPreheat.py
@@ -13,7 +13,7 @@ from database.connect import RedisPool
 
 PreheatLoader = Callable[[], object]
 PreheatTask = tuple[str, PreheatLoader]
-PREHEAT_LOCK_KEY = 'dcalc:preheat:lock'
+PREHEAT_LOCK_KEY = 'dcalc_sys:preheat:lock'
 PREHEAT_LOCK_EXPIRE_SECONDS = 15 * 60