diff --git a/govdelivery.module b/govdelivery.module
index 6c42d86..3a8c644 100644
--- a/govdelivery.module
+++ b/govdelivery.module
@@ -4,6 +4,8 @@
  * GovDelivery TMS module.
  */
 
+use Drupal\Core\DrupalKernel;
+
 /**
  * Implements hook_mail().
  */
@@ -38,7 +40,7 @@ function govdelivery_trusted_host() {
   $request = \Drupal::request();
   $host_patterns = $request->getTrustedHosts();
   if (PHP_SAPI !== 'cli' && !empty($host_patterns)) {
-    if (static::setupTrustedHosts($request, $host_patterns) === FALSE) {
+    if (DrupalKernel::setupTrustedHosts($request, $host_patterns) === FALSE) {
       return FALSE;
     }
   }