diff --git a/lib/Trello/Api/Card/Members.php b/lib/Trello/Api/Card/Members.php
index 7a0061d..37e5665 100644
--- a/lib/Trello/Api/Card/Members.php
+++ b/lib/Trello/Api/Card/Members.php
@@ -46,7 +46,9 @@ public function set($id, array $members)
 
         $members = implode(',', $members);
 
-        return $this->put($this->getPath($id), array('value' => $members));
+        $path = str_replace("/members", "/idMembers", $this->getPath($id));
+
+        return $this->put($path, array('value' => $members));
     }
 
     /**