diff --git a/tests/PropertyTypeTest.php b/tests/PropertyTypeTest.php
index 940c6bcfa..ab88814f6 100644
--- a/tests/PropertyTypeTest.php
+++ b/tests/PropertyTypeTest.php
@@ -167,6 +167,7 @@ class PropertyTypeTest extends TestCase
                 'error_levels' => [
                     'UndefinedThisPropertyFetch',
                     'MixedAssignment',
+                    'MixedArgument',
                     'MixedMethodCall',
                     'MixedPropertyFetch',
                 ],