diff -u b/core/modules/views/src/Form/ViewsExposedForm.php b/core/modules/views/src/Form/ViewsExposedForm.php
--- b/core/modules/views/src/Form/ViewsExposedForm.php
+++ b/core/modules/views/src/Form/ViewsExposedForm.php
@@ -130,7 +130,7 @@
       // If we are building an ajax form, don't set the action to the views
       // ajax route.
       $current = Url::fromRoute('<current>');
-      if (!$current->getRouteName() == 'views.ajax') {
+      if ($current->getRouteName() !== 'views.ajax') {
         $form_action = $current->toString();
       }
       else {