diff --git a/code/SiteConfig.php b/code/SiteConfig.php
index 111d1cf6d..99ab4e0a2 100644
--- a/code/SiteConfig.php
+++ b/code/SiteConfig.php
@@ -309,10 +309,7 @@ public function getCMSActions()
         return $actions;
     }
 
-    /**
-     * @return string
-     */
-    public function CMSEditLink()
+    public function CMSEditLink(): ?string
     {
         return SiteConfigLeftAndMain::singleton()->Link();
     }