diff --git a/src/Runtime/LoopIterator.php b/src/Runtime/LoopIterator.php
index a1112a83ff..db9c0ce717 100644
--- a/src/Runtime/LoopIterator.php
+++ b/src/Runtime/LoopIterator.php
@@ -49,10 +49,9 @@ public function __construct($seq)
                 $seq = $seq->getIterator();
             } while ($seq instanceof \IteratorAggregate);
             $this->seq = $seq;
-        } elseif ($seq instanceof \Iterator) {
-            $this->seq = $seq;
         } elseif (is_iterable($seq)) {
-            $this->seq = new \IteratorIterator($seq);
+            /** @var \Iterator<TKey, TValue> $seq */
+            $this->seq = $seq;
         } else {
             $this->seq = new \EmptyIterator();
         }