diff --git a/src/component/SeleniumBrowser.js b/src/component/SeleniumBrowser.js
index a8cd653..5719021 100644
--- a/src/component/SeleniumBrowser.js
+++ b/src/component/SeleniumBrowser.js
@@ -34,7 +34,7 @@ class SeleniumBrowser {
                 })
             }
         }, {
-            max: 20, min: 1
+            max: 20, min: 1, testOnBorrow: true
         });
 
         this.pool.on('factoryCreateError', function (err) {