diff --git a/core/tests/Drupal/Tests/Core/Access/CsrfTokenGeneratorTest.php b/core/tests/Drupal/Tests/Core/Access/CsrfTokenGeneratorTest.php
index 8607304..81ac83d 100644
--- a/core/tests/Drupal/Tests/Core/Access/CsrfTokenGeneratorTest.php
+++ b/core/tests/Drupal/Tests/Core/Access/CsrfTokenGeneratorTest.php
@@ -84,6 +84,9 @@ public function testValidate() {
    * @dataProvider providerTestValidateParameterTypes
    */
   public function testValidateParameterTypes($token, $value) {
+    // Ensure that there is a valid token seed on the session.
+    $ignored_token = $this->generator->get();
+
     // The following check might throw PHP fatals and notices, so we disable
     // error assertions.
     set_error_handler(function () {return TRUE;});
@@ -117,6 +120,9 @@ public function providerTestValidateParameterTypes() {
    * @expectedException InvalidArgumentException
    */
   public function testInvalidParameterTypes($token, $value = '') {
+    // Ensure that there is a valid token seed on the session.
+    $ignored_token = $this->generator->get();
+
     $this->generator->validate($token, $value);
   }