diff --git a/src/Composer/Json/JsonFile.php b/src/Composer/Json/JsonFile.php
index 206ee662e..d4f851f8a 100644
--- a/src/Composer/Json/JsonFile.php
+++ b/src/Composer/Json/JsonFile.php
@@ -13,6 +13,7 @@
 namespace Composer\Json;
 
 use Composer\Pcre\Preg;
+use Composer\Util\Filesystem;
 use JsonSchema\Validator;
 use Seld\JsonLint\JsonParser;
 use Seld\JsonLint\ParsingException;
@@ -93,7 +94,7 @@ class JsonFile
             if ($this->httpDownloader) {
                 $json = $this->httpDownloader->get($this->path)->getBody();
             } else {
-                if (!is_readable($this->path)) {
+                if (!Filesystem::isReadable($this->path)) {
                     throw new \RuntimeException('The file "'.$this->path.'" is not readable.');
                 }
                 if ($this->io && $this->io->isDebug()) {
@@ -193,7 +194,7 @@ class JsonFile
      */
     public function validateSchema(int $schema = self::STRICT_SCHEMA, ?string $schemaFile = null): bool
     {
-        if (!is_readable($this->path)) {
+        if (!Filesystem::isReadable($this->path)) {
             throw new \RuntimeException('The file "'.$this->path.'" is not readable.');
         }
         $content = file_get_contents($this->path);