diff --git a/src/PhpSeleniumServer.php b/src/PhpSeleniumServer.php
index 1e78b3c..99cbc78 100644
--- a/src/PhpSeleniumServer.php
+++ b/src/PhpSeleniumServer.php
@@ -22,7 +22,7 @@ public function __construct(string $seleniumServerPath = null)
             }
             $this->seleniumServerPath = $seleniumServerPath;
         } else {
-            $seleniumServerPath = dirname(dirname(__FILE__)).'/vendor/bin/selenium-server-standalone';
+            $seleniumServerPath = dirname(dirname(dirname(dirname(dirname(__FILE__))))).'/vendor/bin/selenium-server-standalone';
             if (!file_exists($seleniumServerPath)) {
                 throw new PhpSeleniumServerException('Not found selenium-server-standalone. Please specify the file path.');
             }
diff --git a/tests/PhpSeleniumServerTest.php b/tests/PhpSeleniumServerTest.php
index ed47a94..6cd6787 100644
--- a/tests/PhpSeleniumServerTest.php
+++ b/tests/PhpSeleniumServerTest.php
@@ -8,7 +8,7 @@ public function testGetPidIsNull()
         /**
          * @var \Hayatravis\Pss\PhpSeleniumServer $mock
          */
-        $mock = Phake::partialMock('Hayatravis\Pss\PhpSeleniumServer');
+        $mock = Phake::partialMock('Hayatravis\Pss\PhpSeleniumServer', dirname(dirname(__FILE__)).'/vendor/bin/selenium-server-standalone');
         $this->assertNull($mock->getPid());
     }
 
@@ -24,7 +24,7 @@ public function testGetPid()
         /**
          * @var \Hayatravis\Pss\PhpSeleniumServer $mock
          */
-        $mock = Phake::partialMock('Hayatravis\Pss\PhpSeleniumServer');
+        $mock = Phake::partialMock('Hayatravis\Pss\PhpSeleniumServer', dirname(dirname(__FILE__)).'/vendor/bin/selenium-server-standalone');
         $mock->startSeleniumServer();
         $this->assertNotNull($mock->getPid());
         $mock->stopSeleniumServer();
@@ -35,7 +35,7 @@ public function testStartSeleniumServer()
         /**
          * @var \Hayatravis\Pss\PhpSeleniumServer $mock
          */
-        $mock = Phake::partialMock('Hayatravis\Pss\PhpSeleniumServer');
+        $mock = Phake::partialMock('Hayatravis\Pss\PhpSeleniumServer', dirname(dirname(__FILE__)).'/vendor/bin/selenium-server-standalone');
         $mock->startSeleniumServer();
         $command = 'ps aux | grep selenium-server-standalone';
         passthru($command);
@@ -48,7 +48,7 @@ public function testIsStopSeleniumServerIsTrue()
         /**
          * @var \Hayatravis\Pss\PhpSeleniumServer $mock
          */
-        $mock = Phake::partialMock('Hayatravis\Pss\PhpSeleniumServer');
+        $mock = Phake::partialMock('Hayatravis\Pss\PhpSeleniumServer', dirname(dirname(__FILE__)).'/vendor/bin/selenium-server-standalone');
         $mock->startSeleniumServer();
         $this->assertFalse($mock->isStopSeleniumServer());
         $mock->stopSeleniumServer();
@@ -59,7 +59,7 @@ public function testIsStopSeleniumServerIsFalse()
         /**
          * @var \Hayatravis\Pss\PhpSeleniumServer $mock
          */
-        $mock = Phake::partialMock('Hayatravis\Pss\PhpSeleniumServer');
+        $mock = Phake::partialMock('Hayatravis\Pss\PhpSeleniumServer', dirname(dirname(__FILE__)).'/vendor/bin/selenium-server-standalone');
         $this->assertTrue($mock->isStopSeleniumServer());
     }
 }
\ No newline at end of file