diff --git a/lib/RateLimiterPrisma.js b/lib/RateLimiterPrisma.js
index 497d3eb..eb19986 100644
--- a/lib/RateLimiterPrisma.js
+++ b/lib/RateLimiterPrisma.js
@@ -120,6 +120,7 @@ class RateLimiterPrisma extends RateLimiterStoreAbstract {
       });
       this._clearExpiredHourAgo();
     }, 300000); // Clear every 5 minutes
+    this._clearExpiredTimeoutId.unref();
   }
 }