diff --git a/core/lib/Drupal/Core/Ajax/AjaxHelperTrait.php b/core/lib/Drupal/Core/Ajax/AjaxHelperTrait.php
index d7692b3a83..287abae321 100644
--- a/core/lib/Drupal/Core/Ajax/AjaxHelperTrait.php
+++ b/core/lib/Drupal/Core/Ajax/AjaxHelperTrait.php
@@ -18,12 +18,12 @@
    *   TRUE if the current request is via AJAX, FALSE otherwise.
    */
   protected function isAjax() {
-    return in_array($this->getRequestWrapperFormat(), [
-      'drupal_ajax',
-      'drupal_dialog',
-      'drupal_dialog.off_canvas',
-      'drupal_modal',
-    ]);
+    foreach (['drupal_ajax', 'drupal_modal', 'drupal_dialog'] as $wrapper) {
+      if (strpos($this->getRequestWrapperFormat(), $wrapper) !== FALSE) {
+        return TRUE;
+      }
+    }
+    return FALSE;
   }
 
   /**