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diff --git a/vendor/symfony/finder/Iterator/SortableIterator.php b/vendor/symfony/finder/Iterator/SortableIterator.php
index c2f54b937..53f8e31c6 100644
--- a/vendor/symfony/finder/Iterator/SortableIterator.php
+++ b/vendor/symfony/finder/Iterator/SortableIterator.php
@@ -63,7 +63,7 @@ class SortableIterator implements \IteratorAggregate
             $this->sort = function ($a, $b) {
                 return $a->getMTime() - $b->getMTime();
             };
-        } elseif (is_callable($sort)) {
+        } elseif (\is_callable($sort)) {
             $this->sort = $sort;
         } else {
             throw new \InvalidArgumentException('The SortableIterator takes a PHP callable or a valid built-in sort algorithm as an argument.');