@ -344,7 +344,7 @@ class ClassLoader
private function findFileWithExtension($class, $ext)
{
// PSR-4 lookup
$logicalPathPsr4 = str_replace('\\', DIRECTORY_SEPARATOR, $class) . $ext;
$logicalPathPsr4 = ('\\' !== DIRECTORY_SEPARATOR ? str_replace('\\', DIRECTORY_SEPARATOR, $class) : $class) . $ext;
$first = $class[0];
if (isset($this->prefixLengthsPsr4[$first])) {