diff --git a/lib/Pool.js b/lib/Pool.js
index 0a006dd..d014052 100644
--- a/lib/Pool.js
+++ b/lib/Pool.js
@@ -402,7 +402,7 @@ class Pool extends EventEmitter {
       this._scheduledEviction = setTimeout(() => {
         this._evict();
         this._scheduleEvictorRun();
-      }, this._config.evictionRunIntervalMillis);
+      }, this._config.evictionRunIntervalMillis).unref();
     }
   }