diff --git a/src/Symfony/Component/Process/PhpSubprocess.php b/src/Symfony/Component/Process/PhpSubprocess.php
index a97f8b26e0c55..04fd8ea879c07 100644
--- a/src/Symfony/Component/Process/PhpSubprocess.php
+++ b/src/Symfony/Component/Process/PhpSubprocess.php
@@ -106,7 +106,7 @@ private function writeTmpIni(array $iniFiles, string $tmpDir): string
                 throw new RuntimeException('Unable to read ini: '.$file);
             }
             // Check and remove directives after HOST and PATH sections
-            if (preg_match('/^\s*\[(?:PATH|HOST)\s*=/mi', $data, $matches)) {
+            if (preg_match('/^\s*\[(?:PATH|HOST)\s*=/mi', $data, $matches, \PREG_OFFSET_CAPTURE)) {
                 $data = substr($data, 0, $matches[0][1]);
             }