diff --git a/third_party/blink/renderer/platform/wtf/deque.h b/third_party/blink/renderer/platform/wtf/deque.h
index 29cce7c57..07233c4 100644
--- a/third_party/blink/renderer/platform/wtf/deque.h
+++ b/third_party/blink/renderer/platform/wtf/deque.h

@@ -236,6 +236,7 @@
   typedef T& reference;
   typedef std::bidirectional_iterator_tag iterator_category;
 
+  DequeIterator() = default;
   DequeIterator(Deque<T, inlineCapacity, Allocator>* deque, wtf_size_t index)
       : Base(deque, index) {}