diff --git a/badges/lib/backpacklib.php b/badges/lib/backpacklib.php
index 58a9b745e50..4ecf084257e 100644
--- a/badges/lib/backpacklib.php
+++ b/badges/lib/backpacklib.php
@@ -60,10 +60,11 @@ class OpenBadgesBackpackHandler {
         }
 
         $options = array(
-            'FRESH_CONNECT' => true,
+            'FRESH_CONNECT'  => true,
             'RETURNTRANSFER' => true,
-            'FORBID_REUSE' => true,
-            'HEADER' => 0,
+            'FORBID_REUSE'   => true,
+            'HEADER'         => 0,
+            'HTTPHEADER'     => array('Expect:'),
             'CONNECTTIMEOUT' => 3,
         );