diff --git a/tests/src/Type/data/bug-857.php b/tests/src/Type/data/bug-857.php
index a386a2a1..43d48c89 100644
--- a/tests/src/Type/data/bug-857.php
+++ b/tests/src/Type/data/bug-857.php
@@ -14,7 +14,7 @@ function mixed_function(): mixed {}
 
 // If the type is narrowed before '::assertAll()', it shouldn't change it.
 $array = mixed_function();
-assertType('mixed~null', $array);
+assertType('mixed', $array);
 \assert(Inspector::assertAllArrays($array));
 assertType('iterable<array>', $array);
 \assert(Inspector::assertAll(fn (array $i): bool => TRUE, $array));