diff --git a/src/Symfony/Bridge/Propel1/Form/ChoiceList/ModelChoiceList.php b/src/Symfony/Bridge/Propel1/Form/ChoiceList/ModelChoiceList.php
index e882571370..0a2585fe16 100644
--- a/src/Symfony/Bridge/Propel1/Form/ChoiceList/ModelChoiceList.php
+++ b/src/Symfony/Bridge/Propel1/Form/ChoiceList/ModelChoiceList.php
@@ -372,6 +372,6 @@ class ModelChoiceList extends ObjectChoiceList
      */
     private function isInteger($col)
     {
-        return $col->getPdoType() === PDO::PARAM_INT;
+        return $col->getPdoType() === \PDO::PARAM_INT;
     }
 }