diff --git a/lib/Doctrine/Expression.php b/lib/Doctrine/Expression.php
index cc805bae8..2f429b219 100644
--- a/lib/Doctrine/Expression.php
+++ b/lib/Doctrine/Expression.php
@@ -94,4 +94,9 @@ class Doctrine_Expression
 
         return $this->_expression;
     }
+
+    public function __toString()
+    {
+        return $this->getSql();
+    }
 }