diff --git a/src/img-optm.cls.php b/src/img-optm.cls.php
index ef96f98eb..c6f6c30bc 100644
--- a/src/img-optm.cls.php
+++ b/src/img-optm.cls.php
@@ -1134,7 +1134,7 @@ public function pull($manual = false)
 				$total_pulled_ori++;
 			};
 
-			if (class_exists('\WpOrg\Requests\Requests') && class_exists('\WpOrg\Requests\Autoload')) {
+			if (class_exists('\WpOrg\Requests\Requests') && class_exists('\WpOrg\Requests\Autoload') && !version_compare(PHP_VERSION, '5.6.0', '<')) {
 				// Make sure Requests can load internal classes.
 				Autoload::register();