diff --git a/src/Forms/DropdownField.php b/src/Forms/DropdownField.php
index a18fc878c..53a354fc0 100644
--- a/src/Forms/DropdownField.php
+++ b/src/Forms/DropdownField.php
@@ -106,7 +106,7 @@ class DropdownField extends SingleSelectField
         }
 
         return new ArrayData(array(
-            'Title' => $title,
+            'Title' => (string)$title,
             'Value' => $value,
             'Selected' => $selected,
             'Disabled' => $disabled,