diff --git a/src/Util/PHP/WindowsPhpProcess.php b/src/Util/PHP/WindowsPhpProcess.php
index 509670bca18..bd19df2b8b0 100644
--- a/src/Util/PHP/WindowsPhpProcess.php
+++ b/src/Util/PHP/WindowsPhpProcess.php
@@ -20,7 +20,7 @@ final class WindowsPhpProcess extends DefaultPhpProcess
 {
     public function getCommand(array $settings, string $file = null): string
     {
-        if (PHP_MAJOR_VERSION < 8) {
+        if (\PHP_MAJOR_VERSION < 8) {
             return '"' . parent::getCommand($settings, $file) . '"';
         }