diff --git a/lib/addon/sfPropelData.class.php b/lib/addon/sfPropelData.class.php
index a46062150..c56d86d1b 100644
--- a/lib/addon/sfPropelData.class.php
+++ b/lib/addon/sfPropelData.class.php
@@ -224,7 +224,9 @@ public function loadDataFromArray($data)
         // save the object for future reference
         if (method_exists($obj, 'getPrimaryKey'))
         {
-          $this->object_references[$class.'_'.$key] = $obj;
+          $peer = $class::PEER;
+          $class_key = $peer::OM_CLASS;
+          $this->object_references[$class_key.'_'.$key] = $obj;
         }
       }
     }