diff --git a/code/ZenValidatorConstraint.php b/code/ZenValidatorConstraint.php
index f7f32ce..f2e2c37 100644
--- a/code/ZenValidatorConstraint.php
+++ b/code/ZenValidatorConstraint.php
@@ -6,6 +6,7 @@
 use SilverStripe\View\Requirements;
 use SilverStripe\i18n\i18n;
 use SilverStripe\Forms\CheckboxSetField;
+use SilverStripe\Control\Controller;
 use SilverStripe\Control\Director;
 
 /**