diff --git a/src/BillComApi/BillCom.php b/src/BillComApi/BillCom.php
index 268d9c0..a536ea2 100644
--- a/src/BillComApi/BillCom.php
+++ b/src/BillComApi/BillCom.php
@@ -305,7 +305,7 @@ public function delete($obj_url, $obj_id)
      */
     public function approve_object($data)
     {
-        if ($data['entity'] != "Bill" || $data['entity'] != "VendorCredit") {
+        if ($data['entity'] != "Bill" && $data['entity'] != "VendorCredit") {
             throw new BillcomException("Invalid entity type.  Only Bill or VendorCredit is supported.");
         }