diff --git a/forms/FormScaffolder.php b/forms/FormScaffolder.php
index 1b65034d7..d02b60189 100644
--- a/forms/FormScaffolder.php
+++ b/forms/FormScaffolder.php
@@ -121,7 +121,7 @@ class FormScaffolder extends Object {
 						$component,
 						$relationshipFields,
 						"getCMSFields", 
-						"$foreignKey = $this->obj->ID"
+						"$foreignKey = " . $this->obj->ID
 					);
 					$ctf->setPermissions(TableListField::permissions_for_object($component));
 					if($this->tabbed) {