diff --git a/src/Client.php b/src/Client.php
index 71606b3949..34fac60c84 100644
--- a/src/Client.php
+++ b/src/Client.php
@@ -832,7 +832,7 @@ public function send(Request $request = null)
 
                 if (!empty($queryArray)) {
                     $newUri = $uri->toString();
-                    $queryString = http_build_query($query, null, $this->getArgSeparator());
+                    $queryString = http_build_query($queryArray, null, $this->getArgSeparator());
 
                     if ($this->config['rfc3986strict']) {
                         $queryString = str_replace('+', '%20', $queryString);
diff --git a/test/ClientTest.php b/test/ClientTest.php
index da22793267..3ef89364e2 100644
--- a/test/ClientTest.php
+++ b/test/ClientTest.php
@@ -395,4 +395,36 @@ public function testCanSpecifyCustomAuthMethodsInExtendingClasses()
             $client
         );
     }
+
+    /**
+     * @group 6231
+     */
+    public function testHttpQueryParametersCastToString()
+    {
+        $client = new Client();
+
+        /* @var $adapter \PHPUnit_Framework_MockObject_MockObject|\Zend\Http\Client\Adapter\AdapterInterface */
+        $adapter = $this->getMock('Zend\Http\Client\Adapter\AdapterInterface');
+
+        $client->setAdapter($adapter);
+
+        $request = new Request();
+
+        $request->setUri('http://example.com/');
+        $request->getQuery()->set('foo', 'bar');
+
+        $response = new Response();
+
+        $adapter
+            ->expects($this->once())
+            ->method('write')
+            ->with(Request::METHOD_GET, 'http://example.com/?foo=bar');
+
+        $adapter
+            ->expects($this->any())
+            ->method('read')
+            ->will($this->returnValue($response->toString()));
+
+        $client->send($request);
+    }
 }