diff --git a/src/Transport/Curl.php b/src/Transport/Curl.php
index df98894a3..8e99092a1 100644
--- a/src/Transport/Curl.php
+++ b/src/Transport/Curl.php
@@ -245,6 +245,10 @@ public function request_multiple($requests, $options) {
 		do {
 			$active = 0;
 
+			if ($active) {
+				curl_multi_select($multihandle);
+			}
+
 			do {
 				$status = curl_multi_exec($multihandle, $active);
 			}