diff --git a/tests/integration/features/bootstrap/ServerContext.php b/tests/integration/features/bootstrap/ServerContext.php
index 5116aaa92..56a172aa1 100644
--- a/tests/integration/features/bootstrap/ServerContext.php
+++ b/tests/integration/features/bootstrap/ServerContext.php
@@ -23,6 +23,7 @@ class ServerContext implements Context {
 	 * @Given /^acting as user "([^"]*)"$/
 	 */
 	public function actingAsUser($user) {
+		$this->cookieJar = new CookieJar();
 		$this->loggingInUsingWebAs($user);
 		$this->asAn($user);
 	}