diff --git a/core/restservices.class.inc.php b/core/restservices.class.inc.php
index 5288714d2..03ad1ba95 100644
--- a/core/restservices.class.inc.php
+++ b/core/restservices.class.inc.php
@@ -469,7 +469,13 @@ class CoreServices implements iRestServiceProvider
 			{
                                 if (!$bExtendedOutput && RestUtils::GetOptionalParam($aParams, 'output_fields', '*') != '*') 
                                 {
-                                        $aAttToLoad = array($oObjectSet->GetClassAlias() => $aShowFields[$sClass]);
+                                        $aFields = $aShowFields[$sClass];
+                                        //Id is not a valid attribute to optimize
+                                        if (in_array('id', $aFields)) 
+                                        {
+                                            unset($aFields[array_search('id', $aFields)]);
+                                        }
+                                        $aAttToLoad = array($oObjectSet->GetClassAlias() => $aFields);
                                         $oObjectSet->OptimizeColumnLoad($aAttToLoad);
                                 }