diff --git a/tests/functional/plupload_test.php b/tests/functional/plupload_test.php
index d358681ad1..7735d82ed4 100644
--- a/tests/functional/plupload_test.php
+++ b/tests/functional/plupload_test.php
@@ -107,11 +107,11 @@ class phpbb_functional_plupload_test extends phpbb_functional_test_case
 
 			if ($i < self::CHUNKS - 1)
 			{
-				$this->assertContains('{"jsonrpc":"2.0","id":"id","result":null}', self::$client->getResponse()->getContent());
+				$this->assertContains('{"jsonrpc":"2.0","id":"id","result":null}', self::get_content());
 			}
 			else
 			{
-				$response = json_decode(self::$client->getResponse()->getContent(), true);
+				$response = json_decode(self::get_content(), true);
 				$this->assertEquals('valid.jpg', $response['data'][0]['real_filename']);
 			}
 
@@ -148,7 +148,7 @@ class phpbb_functional_plupload_test extends phpbb_functional_test_case
 			array('X-PHPBB-USING-PLUPLOAD' => '1')
 		);
 
-		$response = json_decode(self::$client->getResponse()->getContent(), true);
+		$response = json_decode((string) self::get_content(), true);
 		$this->assertEquals('valid.jpg', $response['data'][0]['real_filename']);
 	}
 }