diff --git a/src/AuthHandler/Guzzle6AuthHandler.php b/src/AuthHandler/Guzzle6AuthHandler.php
index 13f9ee59d..7e8a815c2 100644
--- a/src/AuthHandler/Guzzle6AuthHandler.php
+++ b/src/AuthHandler/Guzzle6AuthHandler.php
@@ -105,11 +105,6 @@ public function attachKey(ClientInterface $http, $key)
 
     private function createAuthHttp(ClientInterface $http)
     {
-        return new Client([
-            'base_uri' => $http->getConfig('base_uri'),
-            'http_errors' => true,
-            'verify' => $http->getConfig('verify'),
-            'proxy' => $http->getConfig('proxy'),
-        ]);
+        return new Client(['http_errors' => true] + $http->getConfig());
     }
 }
diff --git a/tests/Google/ClientTest.php b/tests/Google/ClientTest.php
index 391678423..963ea071b 100644
--- a/tests/Google/ClientTest.php
+++ b/tests/Google/ClientTest.php
@@ -997,14 +997,8 @@ public function testCredentialsOptionWithCredentialsLoader()
 
         $httpClient = $this->prophesize('GuzzleHttp\ClientInterface');
         $httpClient->getConfig()
-            ->shouldBeCalledOnce()
+            ->shouldBeCalled()
             ->willReturn(['handler' => $handler->reveal()]);
-        $httpClient->getConfig('base_uri')
-            ->shouldBeCalledOnce();
-        $httpClient->getConfig('verify')
-            ->shouldBeCalledOnce();
-        $httpClient->getConfig('proxy')
-            ->shouldBeCalledOnce();
         $httpClient->send(Argument::any(), Argument::any())
             ->shouldNotBeCalled();