diff --git a/tests/Composer/Test/Downloader/ZipDownloaderTest.php b/tests/Composer/Test/Downloader/ZipDownloaderTest.php
index ced6c0992..80e9378d9 100644
--- a/tests/Composer/Test/Downloader/ZipDownloaderTest.php
+++ b/tests/Composer/Test/Downloader/ZipDownloaderTest.php
@@ -65,11 +65,7 @@ class ZipDownloaderTest extends TestCase
         $reflectionClass = new \ReflectionClass('Composer\Downloader\ZipDownloader');
         $reflectedProperty = $reflectionClass->getProperty($name);
         $reflectedProperty->setAccessible(true);
-        if ($obj === null) {
-            $reflectedProperty->setValue($value);
-        } else {
-            $reflectedProperty->setValue($obj, $value);
-        }
+        $reflectedProperty->setValue($obj, $value);
     }
 
     public function testErrorMessages(): void
diff --git a/tests/Composer/Test/InstalledVersionsTest.php b/tests/Composer/Test/InstalledVersionsTest.php
index 6edd91e04..c227675ca 100644
--- a/tests/Composer/Test/InstalledVersionsTest.php
+++ b/tests/Composer/Test/InstalledVersionsTest.php
@@ -33,14 +33,14 @@ class InstalledVersionsTest extends TestCase
         $prop = new \ReflectionProperty('Composer\Autoload\ClassLoader', 'registeredLoaders');
         $prop->setAccessible(true);
         self::$previousRegisteredLoaders = $prop->getValue();
-        $prop->setValue([]);
+        $prop->setValue(null, []);
     }
 
     public static function tearDownAfterClass(): void
     {
         $prop = new \ReflectionProperty('Composer\Autoload\ClassLoader', 'registeredLoaders');
         $prop->setAccessible(true);
-        $prop->setValue(self::$previousRegisteredLoaders);
+        $prop->setValue(null, self::$previousRegisteredLoaders);
         InstalledVersions::reload(null); // @phpstan-ignore-line
     }