diff --git a/src/PreloadList.php b/src/PreloadList.php
index e4511d6..eb1d4db 100644
--- a/src/PreloadList.php
+++ b/src/PreloadList.php
@@ -4,6 +4,7 @@
 
 use BadMethodCallException;
 use IteratorAggregate;
+use Traversable;
 
 final class PreloadList implements IteratorAggregate {
 
@@ -16,7 +17,7 @@ public function setList(iterable $list): void {
         $this->list = $list;
     }
 
-    public function getIterator(): iterable {
+    public function getIterator(): Traversable {
         if (!$this->list) {
             throw new BadMethodCallException('Attempting to fetch the iterator without setting one first.');
         }