diff --git a/stubs/core.stub b/stubs/core.stub
index 0c6c6236d7..2cb6f29448 100644
--- a/stubs/core.stub
+++ b/stubs/core.stub
@@ -193,7 +193,7 @@ function sscanf(string $string, string $format, &$war, &...$vars) {}
  *                              ? list<array<?string>>
  *                              : (TFlags is 770
  *                                  ? list<array<array{?string, int}>>
- *                                  : array<mixed>
+ *                                  : (TFlags is 0 ? array<list<string>> : array<mixed>)
  *                              )
  *                          )
  *                      )
diff --git a/tests/PHPStan/Analyser/data/param-out-default.php b/tests/PHPStan/Analyser/data/param-out-default.php
index ca2770618e..5d83d593a2 100644
--- a/tests/PHPStan/Analyser/data/param-out-default.php
+++ b/tests/PHPStan/Analyser/data/param-out-default.php
@@ -27,4 +27,10 @@ public function doBar(): void
 		assertType('array<int>', $c);
 	}
 
+	public function sayHello(string $row): void
+	{
+		preg_match_all('#// error:(.+)#', $row, $matches);
+		assertType('array<list<string>>', $matches);
+	}
+
 }