diff --git a/src/BrowserTest.php b/src/BrowserTest.php
index 5beaa2d..873cc9f 100644
--- a/src/BrowserTest.php
+++ b/src/BrowserTest.php
@@ -14,7 +14,9 @@ abstract class BrowserTest extends \PHPUnit_Extensions_Selenium2TestCase{
     $args=explode(' ',getenv('SeleniumBrowserArgsVal'));
     $args[]='screenshot';
     $this->setDesiredCapabilities([getenv('SeleniumBrowserArgsKey')=>['args'=>$args]]);
-    $this->setBrowserUrl(getenv('SeleniumBrowserUrl'));
+    if($url=getenv('SeleniumBrowserUrl')){
+        $this->setBrowserUrl($url);
+    }
     $this->setBrowser(getenv('SeleniumBrowser'));
   }