diff --git a/.gitignore b/.gitignore
index fab41ab..48ff83e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -13,3 +13,4 @@ assets/js/build
 languages/neve-fse.pot
 
 .DS_Store
+.phpunit.result.cache
diff --git a/tests/bootstrap.php b/tests/bootstrap.php
index 6f688bf..cf809b1 100644
--- a/tests/bootstrap.php
+++ b/tests/bootstrap.php
@@ -8,6 +8,11 @@
 define( 'NEVE_FSE_IGNORE_SOURCE_CHECK', true );
 
 $_tests_dir = getenv( 'WP_TESTS_DIR' );
+
+if ( class_exists( '\Yoast\PHPUnitPolyfills\Autoload' ) === false ) {
+	require_once dirname( dirname( __FILE__ ) ) . '/vendor/yoast/phpunit-polyfills/phpunitpolyfills-autoload.php';
+}
+
 if ( ! $_tests_dir ) {
 	$_tests_dir = '/tmp/wordpress-tests-lib';
 }