diff --git a/src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php b/src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php
index 7596b9953bda..4dd4475cbe4c 100644
--- a/src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php
+++ b/src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php
@@ -173,14 +173,14 @@ public function dump(array $options = [])
if (!empty($options['file']) && is_dir($dir = \dirname($options['file']))) {
// Build a regexp where the first root dirs are mandatory,
// but every other sub-dir is optional up to the full path in $dir
- // Mandate at least 2 root dirs and not more that 5 optional dirs.
+ // Mandate at least 1 root dir and not more than 5 optional dirs.
$dir = explode(\DIRECTORY_SEPARATOR, realpath($dir));
$i = \count($dir);
- if (3 <= $i) {
+ if (2 + (int) ('\\' === \DIRECTORY_SEPARATOR) <= $i) {
$regex = '';
- $lastOptionalDir = $i > 8 ? $i - 5 : 3;
+ $lastOptionalDir = $i > 8 ? $i - 5 : (2 + (int) ('\\' === \DIRECTORY_SEPARATOR));
$this->targetDirMaxMatches = $i - $lastOptionalDir;
while (--$i >= $lastOptionalDir) {
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