diff --git a/tests/Zephir/Backends/ZendEngine3/BackendTest.php b/tests/Zephir/Backends/ZendEngine3/BackendTest.php
index bd5bbd39d..dbe6ce76c 100644
--- a/tests/Zephir/Backends/ZendEngine3/BackendTest.php
+++ b/tests/Zephir/Backends/ZendEngine3/BackendTest.php
@@ -41,7 +41,7 @@ public function stringDataProvider(): array
      */
     public function testShouldEscapeStringWithRegexp(string $testString, string $expectedString): void
     {
-        $backend = new Backend(new Config(), null, null);
+        $backend = new Backend(new Config(), '', '');
         $variable = new Variable('variable', 'name');
         $context = new CompilationContext();