diff --git a/src/Symfony/Component/Config/Util/XmlUtils.php b/src/Symfony/Component/Config/Util/XmlUtils.php
index 71f8bf1558..b120fdf188 100644
--- a/src/Symfony/Component/Config/Util/XmlUtils.php
+++ b/src/Symfony/Component/Config/Util/XmlUtils.php
@@ -80,7 +80,8 @@ class XmlUtils
                     $valid = false;
                 }
             } elseif (!is_array($schemaOrCallable) && is_file((string) $schemaOrCallable)) {
-                $valid = @$dom->schemaValidate($schemaOrCallable);
+                $schemaSource = file_get_contents((string) $schemaOrCallable);
+                $valid = @$dom->schemaValidateSource($schemaSource);
             } else {
                 libxml_use_internal_errors($internalErrors);