diff --git a/tests/PHPStan/Analyser/Bug13813IntegrationTest.php b/tests/PHPStan/Analyser/Bug13813IntegrationTest.php
index 25e937cbed..57fd84cf5a 100644
--- a/tests/PHPStan/Analyser/Bug13813IntegrationTest.php
+++ b/tests/PHPStan/Analyser/Bug13813IntegrationTest.php
@@ -17,11 +17,17 @@ class Bug13813IntegrationTest extends PHPStanTestCase
 
 	public function testBug13813(): void
 	{
-		error_reporting(E_ALL);
-		$analyzerResult = $this->runAnalyse([
-			__DIR__ . '/data/bug-13813.php',
-			__DIR__ . '/Bug13813Rule.php',
-		]);
+		$oldReporting = error_reporting();
+
+		try {
+			error_reporting(E_ALL);
+			$analyzerResult = $this->runAnalyse([
+				__DIR__ . '/data/bug-13813.php',
+				__DIR__ . '/Bug13813Rule.php',
+			]);
+		} finally {
+			error_reporting($oldReporting);
+		}
 		$this->assertCount(2, $analyzerResult->getAllPhpErrors());
 		$this->assertCount(2, $analyzerResult->getFilteredPhpErrors());