diff --git a/api/iterator.go b/api/iterator.go
index 2934fd9..6b5fdcd 100644
--- a/api/iterator.go
+++ b/api/iterator.go
@@ -159,7 +159,7 @@ func newIterator(c *Client, path string, options ...IteratorOption) (*Iterator,
 		it.request.SetQueryParam("collapse", it.collapse)
 	}
 
-	if it.size > 0 {
+	if it.size >= 0 {
 		it.request.SetQueryParam("size", strconv.Itoa(it.size))
 	}